diff --git a/maths/binary_exponentiation.py b/maths/binary_exponentiation.py
index 147b4285f..05de939d1 100644
--- a/maths/binary_exponentiation.py
+++ b/maths/binary_exponentiation.py
@@ -4,7 +4,7 @@
 # Time Complexity : O(logn)
 
 
-def binary_exponentiation(a, n):
+def binary_exponentiation(a: int, n: int) -> int:
     if n == 0:
         return 1
 
@@ -12,7 +12,7 @@ def binary_exponentiation(a, n):
         return binary_exponentiation(a, n - 1) * a
 
     else:
-        b = binary_exponentiation(a, n / 2)
+        b = binary_exponentiation(a, n // 2)
         return b * b