diff --git a/README.md b/README.md
index fa0237d..e2ed6ff 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # OpenBootCampPython
 Repository to store Python boot camp.
+
+* Exercise 4: Escribe un programa que sea capaz de mostrar los números del 1 al 100 en orden inverso.
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ee2bf11
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+-i https://pypi.org/simple
+setuptools==65.5.0 ; python_version >= '3.7'
+wheel==0.38.0
diff --git a/src/exercisefour/invertedCount.py b/src/exercisefour/invertedCount.py
new file mode 100644
index 0000000..6582206
--- /dev/null
+++ b/src/exercisefour/invertedCount.py
@@ -0,0 +1,7 @@
+def invertedCount():
+    """Script that show in terminal numbers from 100 to 1
+    :return: None
+    :rtype: NoneType
+    """
+    for i in range(100, 0, -1):
+        print(i)
diff --git a/src/main.py b/src/main.py
new file mode 100644
index 0000000..c980955
--- /dev/null
+++ b/src/main.py
@@ -0,0 +1,13 @@
+from src.exercisefour.invertedCount import invertedCount
+
+
+def main():
+    """Main script for exercise four
+    :return: None
+    :rtype: NoneType
+    """
+    invertedCount()
+
+
+if __name__ == '__main__':
+    main()