diff --git a/d03.py b/d03.py
index 15f4acc..bfc4f33 100755
--- a/d03.py
+++ b/d03.py
@@ -6,17 +6,13 @@ i = [x.strip() for x in open(argv[1])]
 
 h = len(i)
 w = len(i[0])
-
-def check(dx, dy):
-    x = 0
-    y = 0
-    ok = 0
-    while y < h:
+def f(dx, dy):
+    x = ok = 0
+    for y in range(0, h, dy):
         if i[y][x%w] == "#":
             ok += 1
         x += dx
-        y += dy
     return ok
 
-print(check(3,1))
-print(check(1,1)*check(3,1)*check(5,1)*check(7,1)*check(1,2))
+print(f(3,1))
+print(f(1,1)*f(3,1)*f(5,1)*f(7,1)*f(1,2))