diff --git a/problem_3.py b/problem_3.py
index e69de29..e08cf2c 100644
--- a/problem_3.py
+++ b/problem_3.py
@@ -0,0 +1,20 @@
+import math
+
+highest_factor = 1
+
+for x in range(3, int(math.sqrt(600851475143)), 2):
+    if 600851475143 % x == 0:
+
+        prime = True
+        i = 3
+        while i * i < x:
+            if x % i == 0:
+                prime = False # found a factor, not prime
+                break
+            else:
+                i += 2
+
+        if prime:
+            highest_factor = x
+
+print(highest_factor)
\ No newline at end of file