[mypy] fix type annotations for project euler problem014/sol1

Author: pikulet

project_euler/problem_014/sol1.py

@@ -44,7 +44,7 @@ def solution(n: int = 1000000) -> int:
 
         while number > 1:
             if number % 2 == 0:
-                number /= 2
+                number //= 2
                 counter += 1
             else:
                 number = (3 * number) + 1