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diff --git a/Chapter3PracCollate.py b/Chapter3PracCollate.py
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+# The Collatz Sequence
+
+def collatz(number):
+    global result
+    if number % 2 == 0:
+        print(str(number // 2))
+        result = number // 2
+        return result
+    elif number % 2 == 1:
+        print(str(3 * number + 1))
+        result = 3 * number + 1
+        return result
+
+print('Enter number:')
+while True:
+    try:
+        number = int(input())
+    except ValueError:
+        print('The value must be an integer!')
+        continue
+    collatz(number)
+    if result == 1:
+        break