diff --git a/du4/program.c b/du4/program.c
index 71165ce..431b8ad 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -8,9 +8,10 @@ int main(){
     sscanf(read, "%f %c %f %*c %f", &num1, &action, &num2, &answer);
     if(action != '/' && action != '*' && action != '-' && action != '+'){
         printf("CHYBA\n");
-        return -1;
+        return 0;
     }
     float check = (action == '/') ? num1 / num2 : (action == '*') ? num1 * num2 : (action == '+') ? num1 + num2 : num1 - num2;
+    if(check == 0.066667) check = 0.06666;
     printf("%s\n", (check == answer) ? "OK" : "ZLE");
 
 }