diff --git a/src/lesson2/engine.ts b/src/lesson2/engine.ts
index 78aee1d7..edb67304 100644
--- a/src/lesson2/engine.ts
+++ b/src/lesson2/engine.ts
@@ -4,9 +4,27 @@ import {
   mathOperators,
   mathPriorities,
   mathOperatorsPriorities,
+  UnionOperationType,
+  unionOperators
 } from "./mathOperators";
 
-const [FIRST, SECOND] = mathPriorities;
+const [ZERO, FIRST, SECOND] = mathPriorities;
+
+export const zeroPrioritiesCalc = (stack: ParsedLineType): ParsedLineType =>
+  stack.reduce<ParsedLineType>((result, item) => {
+    const prevItem = result[result.length - 1];
+
+    if (!isNumber(String(item)) && mathOperatorsPriorities[item] === ZERO) {
+      if (!unionOperators[item]) {
+        throw new TypeError("Unexpected stack!");
+      }
+      const action = unionOperators[item] as UnionOperationType;
+      result = [...result.slice(0, -1), action(Number(prevItem))];
+    } else {
+      result.push(item);
+    }
+    return result;
+  }, []);
 
 export const firstPrioritiesCalc = (stack: ParsedLineType): ParsedLineType =>
   stack.reduce<ParsedLineType>((result, nextItem) => {
@@ -27,6 +45,8 @@ export const firstPrioritiesCalc = (stack: ParsedLineType): ParsedLineType =>
     return result;
   }, []);
 
+  
+
 export const secondPrioritiesCalc = (stack: ParsedLineType): number =>
   stack.reduce<number>((result, nextItem, key) => {
     const item = stack[key - 1];
@@ -35,8 +55,11 @@ export const secondPrioritiesCalc = (stack: ParsedLineType): number =>
       throw new TypeError("Unexpected stack!");
     }
 
-    if (!isNumber(String(item)) && mathOperatorsPriorities[item] === SECOND) {
+    if (!isNumber(String(item)) &&
+     mathOperatorsPriorities[item] === SECOND &&
+     item !== undefined) {
       result = mathOperators[item](Number(result), Number(nextItem));
     }
     return result;
   }, Number(stack[0]));
+
diff --git a/src/lesson2/helpers.ts b/src/lesson2/helpers.ts
index b5a4b6ae..7e52e94a 100644
--- a/src/lesson2/helpers.ts
+++ b/src/lesson2/helpers.ts
@@ -1 +1,14 @@
+import { mathOperators,
+unionOperators } from "./mathOperators";
+
+import { zeroPrioritiesCalc,
+  firstPrioritiesCalc,
+  secondPrioritiesCalc } from "./engine";
+
+import { parser } from "./parser";
+
 export const isNumber = (item: string): boolean => !isNaN(Number(item));
+
+export const isOperator = (item: string): boolean => item in mathOperators;
+
+export const isUnionOperator = (item: string): boolean => item in unionOperators;
\ No newline at end of file
diff --git a/src/lesson2/mathOperators.test.ts b/src/lesson2/mathOperators.test.ts
index aad07e8d..4638de73 100644
--- a/src/lesson2/mathOperators.test.ts
+++ b/src/lesson2/mathOperators.test.ts
@@ -1,4 +1,4 @@
-import { mul, div, add, minus } from "./mathOperators";
+import { mul, div, add, minus, factorial, pow, sqr } from "./mathOperators";
 
 describe("mathOperators test cases", () => {
   it("mul 1 * 2 to equal 2", () => {
@@ -21,7 +21,39 @@ describe("mathOperators test cases", () => {
     expect(add(4, 2)).toBe(6);
   });
 
+  it("add 10 + 12 to equal 22", () => {
+    expect(add(10, 12)).toBe(22);
+  });
+
   it("minus 4 - 2 to equal 2", () => {
     expect(minus(4, 2)).toBe(2);
   });
+
+  it("minus 34 - 20 to equal 14", () => {
+    expect(minus(34, 20)).toBe(14);
+  });
+
+  it("factorial 5 to equal 120", () => {
+    expect(factorial(5)).toBe(120);
+  });
+
+  it("factorial 3 to equal 6", () => {
+    expect(factorial(3)).toBe(6);
+  });
+
+  it("power 3 * 4 to equal 81", () => {
+    expect(pow(3, 4)).toBe(81);
+  });
+
+  it("power 5 * 6 to equal 15625", () => {
+    expect(pow(5, 6)).toBe(15625);
+  });
+
+  it("sqr 6 to equal 36", () => {
+    expect(sqr(6)).toBe(36);
+  });
+
+  it("sqr 10 to equal 100", () => {
+    expect(sqr(10)).toBe(100);
+  });
 });
diff --git a/src/lesson2/mathOperators.ts b/src/lesson2/mathOperators.ts
index af8eb770..923e01c7 100644
--- a/src/lesson2/mathOperators.ts
+++ b/src/lesson2/mathOperators.ts
@@ -1,4 +1,7 @@
 export type ScalarOperationType = (first: number, second: number) => number;
+export type UnionOperationType = (first: number) => number;
+
+export type MathOperationType = UnionOperationType | ScalarOperationType;
 
 export const mul: ScalarOperationType = (
   first: number,
@@ -20,19 +23,39 @@ export const minus: ScalarOperationType = (
   second: number
 ): number => first - second;
 
-export const mathOperators: { [key: string]: ScalarOperationType } = {
+export const pow: ScalarOperationType = (
+  first: number,
+  second: number
+): number => Math.pow(first, second);
+
+export const factorial: UnionOperationType = (first: number): number => {
+  return first ? first * factorial(first - 1) : 1;
+};
+
+export const sqr: UnionOperationType = (first: number): number => pow(first, 2);
+
+export const unionOperators: { [key: string]: MathOperationType } = {
+  "!": factorial,
+  "**": sqr,
+};
+
+export const mathOperators: { [key: string]: MathOperationType } = {
   "*": mul,
   "/": div,
   "+": add,
   "-": minus,
+  "^": pow,
 };
 
-export const mathPriorities: number[] = [1, 2];
+export const mathPriorities: number[] = [0, 1, 2];
 
-const [FIRST, SECOND] = mathPriorities;
+const [ZERO, FIRST, SECOND] = mathPriorities;
 
 export const mathOperatorsPriorities: { [key: string]: number } = {
+  "!": ZERO,
+  "**": ZERO,
   "*": FIRST,
+  "^": FIRST,
   "/": FIRST,
   "+": SECOND,
   "-": SECOND,
diff --git a/src/lesson2/parseBrackets.test.ts b/src/lesson2/parseBrackets.test.ts
new file mode 100644
index 00000000..1c0226ed
--- /dev/null
+++ b/src/lesson2/parseBrackets.test.ts
@@ -0,0 +1,27 @@
+import { parseBrackets } from "./parseBrackets";
+
+describe("parseBrackets correct cases", () => {
+  it("(1 + 32) * 2", () => {
+    expect(parseBrackets("(1 + 32) * 2")).toEqual("33 * 2");
+  });
+
+  it("66 / (6 + 2 * 20)", () => {
+    expect(parseBrackets("66 / (6 + 2 * 20)")).toEqual("66 / 46");
+  });
+
+  it("1 + 32 - 2 + 2", () => {
+    expect(parseBrackets("(1 + 32) - (2 + 2)")).toEqual("33 - 4");
+  });
+
+  it("1 + (4 * (2 + 2))", () => {
+    expect(parseBrackets("1 + (4 * (2 + 2))")).toEqual("1 + 16");
+  });
+});
+
+describe("parseBrackets invalid cases", () => {
+  it("2 + ((1 + 33 - 2)", () => {
+    expect(() => parseBrackets("2 + ((1 + 33 - 2)")).toThrow(
+      RangeError("Invalid string length")
+    );
+  });
+});
\ No newline at end of file
diff --git a/src/lesson2/parseBrackets.ts b/src/lesson2/parseBrackets.ts
new file mode 100644
index 00000000..1a7ec87e
--- /dev/null
+++ b/src/lesson2/parseBrackets.ts
@@ -0,0 +1,35 @@
+import { parser } from "./parser";
+import { zeroPrioritiesCalc, firstPrioritiesCalc, secondPrioritiesCalc } from "./engine";
+
+export const parseBrackets = (line: string): string  => {
+
+var k = 1;
+
+do {
+var openBracket = line.lastIndexOf("(");
+  if (openBracket < 0) {
+    k = 0;
+  } 
+  else {
+    var closeBracket = line.indexOf(")",openBracket);
+    var inside = line.slice(openBracket+1,closeBracket);
+    var parsed = parser(inside)
+
+    if(parsed === null) {
+      throw new TypeError("Unexpected string");
+    }
+
+    var zeroPriorities = zeroPrioritiesCalc(parsed)
+    var firstPriorities = firstPrioritiesCalc(zeroPriorities)
+    var secondPriorities = secondPrioritiesCalc(firstPriorities)
+
+    var changed = secondPriorities
+
+    line = line.substr(0, openBracket) + changed.toString() + line.substr(closeBracket + 1);
+
+  }
+} while (k==1)
+
+return line;
+
+}
\ No newline at end of file
diff --git a/src/lesson2/parser.test.ts b/src/lesson2/parser.test.ts
index 5593e312..d898f0a6 100644
--- a/src/lesson2/parser.test.ts
+++ b/src/lesson2/parser.test.ts
@@ -12,6 +12,14 @@ describe("Parser correct cases", () => {
   it("1 + 32 - 2 + 2", () => {
     expect(parser("1 + 32 - 2 + 2")).toEqual([1, "+", 32, "-", 2, "+", 2]);
   });
+
+  it("1 + 32 ! - 2 + 2", () => {
+    expect(parser("1 + 32 ! - 2 + 2")).toEqual([1, "+", 32, "!", "-", 2, "+", 2]);
+  });
+
+  it("1 + 32 - 2 + 2 **", () => {
+    expect(parser("1 + 32 - 2 + 2 **")).toEqual([1, "+", 32, "-", 2, "+", 2, "**"]);
+  });
 });
 
 describe("Parser invalid cases", () => {
@@ -24,4 +32,12 @@ describe("Parser invalid cases", () => {
   it("1 ! 33 - 2", () => {
     expect(() => parser("1 ! 33 - 2")).toThrow(TypeError("Unexpected string"));
   });
+
+  it("1 ! ++ 33 - 2", () => {
+    expect(() => parser("1 ! ++ 33 - 2")).toThrow(TypeError("Unexpected string"));
+  });
+
+  it("1 ! 33 - 2 /", () => {
+    expect(() => parser("1 ! 33 - 2 /")).toThrow(TypeError("Unexpected string"));
+  });
 });
diff --git a/src/lesson2/parser.ts b/src/lesson2/parser.ts
index 118ff662..aff18bc7 100644
--- a/src/lesson2/parser.ts
+++ b/src/lesson2/parser.ts
@@ -1,27 +1,41 @@
-import { isNumber } from "./helpers";
-import { mathOperators } from "./mathOperators";
+import { isNumber, isOperator, isUnionOperator } from "./helpers";
+import { mathOperators,
+unionOperators } from "./mathOperators";
+
+import { parseBrackets } from "./parseBrackets";
 
 export type ParsedLineType = (number | string)[];
 
 export const parser = (line: string): ParsedLineType | null => {
-  const stack = line.split(" ");
+  const parsedBrackets = parseBrackets(line)
+  const stack = parsedBrackets.split(" ");
 
   return stack.reduce<ParsedLineType>((result, item, key) => {
     const prevItem = stack[key - 1];
 
-    const isValidNumberPush = !isNumber(prevItem) && isNumber(item);
+    const isValidNumberPush = !isNumber(prevItem) && isNumber(item) && !unionOperators.hasOwnProperty(prevItem);
     const isValidOperatorPush =
-      isNumber(prevItem) &&
+      (isNumber(prevItem) || isUnionOperator(prevItem))  &&
+      !isNumber(item) &&
+      mathOperators.hasOwnProperty(item) &&
+      isOperator(item);
+
+    const isValidUnionOperatorPush =
+      (isNumber(prevItem) || isUnionOperator(prevItem)) &&
       !isNumber(item) &&
-      mathOperators.hasOwnProperty(item);
+      unionOperators.hasOwnProperty(item) &&
+      isUnionOperator(item);
 
     if (isValidNumberPush) {
       result.push(Number(item));
     } else if (isValidOperatorPush) {
       result.push(item);
+    } else if(isValidUnionOperatorPush) {
+      result.push(item);
     } else {
       throw new TypeError("Unexpected string");
     }
+
     return result;
   }, []);
-};
+};
\ No newline at end of file
diff --git a/src/lesson2/runner.test.ts b/src/lesson2/runner.test.ts
index 1318dce3..e78d41f6 100644
--- a/src/lesson2/runner.test.ts
+++ b/src/lesson2/runner.test.ts
@@ -12,6 +12,54 @@ describe("Runner simple cases", () => {
   it("2 + 32", () => {
     expect(runner("2 + 32")).toEqual(34);
   });
+
+  it("5 + 32", () => {
+    expect(runner("5 + 32")).toEqual(37);
+  });
+
+  it("2 - 32", () => {
+    expect(runner("2 - 32")).toEqual(-30);
+  });
+
+  it("25 - 5", () => {
+    expect(runner("25 - 5")).toEqual(20);
+  });
+
+  it("2 / 2", () => {
+    expect(runner("2 / 2")).toEqual(1);
+  });
+
+  it("12 / 3", () => {
+    expect(runner("12 / 3")).toEqual(4);
+  });
+
+  it("2 ^ 2", () => {
+    expect(runner("2 ^ 2")).toEqual(4);
+  });
+
+  it("5 ^ 2", () => {
+    expect(runner("5 ^ 2")).toEqual(25);
+  });
+
+  it("5 ! + 4", () => {
+    expect(runner("5 ! + 4")).toEqual(124);
+  });
+
+  it("3 ! + 4", () => {
+    expect(runner("3 ! + 4")).toEqual(10);
+  });
+
+  it("5 ! * 2", () => {
+    expect(runner("5 ! * 2")).toEqual(240);
+  });
+
+  it("5 ! / 2", () => {
+    expect(runner("5 ! / 2")).toEqual(60);
+  });
+
+  it("5 ! / 4", () => {
+    expect(runner("5 ! / 4")).toEqual(30);
+  });
 });
 
 describe("Runner tripled/mixed cases", () => {
@@ -26,6 +74,22 @@ describe("Runner tripled/mixed cases", () => {
   it("2 + 2 * 3", () => {
     expect(runner("2 + 2 * 3")).toEqual(8);
   });
+
+  it("2 + 2 / 2", () => {
+    expect(runner("2 + 2 / 2")).toEqual(3);
+  });
+
+  it("2 + 2 + 5 !", () => {
+    expect(runner("2 + 2 + 5 !")).toEqual(124);
+  });
+
+  it("2 ^ 2 / 4", () => {
+    expect(runner("2 ^ 2 / 4")).toEqual(1);
+  });
+
+  it("2 ** + 2", () => {
+    expect(runner("2 ** + 2")).toEqual(6);
+  });
 });
 
 describe("Runner long cases", () => {
@@ -36,4 +100,12 @@ describe("Runner long cases", () => {
   it("20 - 10 * 10 / 5 - 3", () => {
     expect(runner("20 - 10 * 10 / 5 - 3")).toEqual(-3);
   });
+
+  it("10 - 5 ** + 10 / 5 - 3", () => {
+    expect(runner("10 - 5 ** + 10 / 5 - 3")).toEqual(-16);
+  });
+
+  it("5 ! - 10 * 10 / 5 - 3", () => {
+    expect(runner("5 ! - 10 * 10 / 5 - 3")).toEqual(97);
+  });
 });
diff --git a/src/lesson2/runner.ts b/src/lesson2/runner.ts
index 920249fd..7eb2f4ba 100644
--- a/src/lesson2/runner.ts
+++ b/src/lesson2/runner.ts
@@ -1,6 +1,6 @@
 import { parser } from "./parser";
 
-import { firstPrioritiesCalc, secondPrioritiesCalc } from "./engine";
+import { zeroPrioritiesCalc, firstPrioritiesCalc, secondPrioritiesCalc } from "./engine";
 
 export const runner = (line: string): number => {
   const stack = parser(line);
@@ -9,11 +9,18 @@ export const runner = (line: string): number => {
     throw new TypeError("Unexpected string");
   }
 
-  const firstPrioritiesRes = firstPrioritiesCalc(stack);
+  const zeroPrioritiesRes = zeroPrioritiesCalc(stack);
+
+  if (zeroPrioritiesRes.length === 1) {
+    return Number(zeroPrioritiesRes[0]);
+  }
+
+  const firstPrioritiesRes = firstPrioritiesCalc(zeroPrioritiesRes);
 
   if (firstPrioritiesRes.length === 1) {
     return Number(firstPrioritiesRes[0]);
   }
 
+  
   return secondPrioritiesCalc(firstPrioritiesRes);
 };