diff --git a/Part-1/euler's project/Projects done/Problem 3.py b/Part-1/euler's project/Projects done/Problem 3.py
index 66ce6dd..e351901 100644
--- a/Part-1/euler's project/Projects done/Problem 3.py	
+++ b/Part-1/euler's project/Projects done/Problem 3.py	
@@ -1,5 +1,5 @@
 number = 1
-while number < 600851475143 :
+while number <= int(600851475143**0.5):
     if 600851475143 % number == 0:
         num = number