diff --git a/du3/program.c b/du3/program.c
index 762247b..e4d61e9 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -17,9 +17,11 @@ int main(){
         puts("Neplatny datum");
         return 0;
     }
-    if(month == 4 || month == 6 || month == 9 || month == 11 && day > 30){
+    if(month == 4 || month == 6 || month == 9 || month == 11){
+if(day > 30){
         puts("Neplatny datum");
         return 0;
+}
     }
 
     day += 7;
@@ -31,9 +33,11 @@ int main(){
         month++;
         day -= 29;
     }
-    else if(month == 4 && month == 6 && month == 9 && month == 11 && day > 30){
+    else if(month == 4 || month == 6 || month == 9 || month == 11){
+if(day > 30){
         month++;
         day -= 30;
+}
     }
     else if(day > 31){
         month++;
@@ -56,4 +60,4 @@ int main(){
     else{
         printf("%d.%d.%d\n\n", day, month, year);
     }
-}
\ No newline at end of file
+}