diff --git a/calc.cpp b/calc.cpp
index 094c3a0..41e4d7b 100644
--- a/calc.cpp
+++ b/calc.cpp
@@ -11,17 +11,22 @@ inline void sub(int &a, int b) {
 }
 
 inline int mul(int a, int b) {
+  
 #if !defined(_WIN32) || defined(_WIN64)
+  
   return (long long) a * b % md;
+  
 #endif
+  
   unsigned long long x = (long long) a * b;
-  unsigned xh = (unsigned) (x >> 32), xl = (unsigned) x, d, m;
+  
+  unsigned xh = (unsigned) (x >> 32), xl = (unsigned) x, s, y;
   asm(
     "divl %4; \n\t"
-    : "=a" (d), "=d" (m)
+    : "=a" (s), "=d" (y)
     : "d" (xh), "a" (xl), "r" (md)
   );
-  return m;
+  return y;
 }
 
 inline int power(int a, int b) {