diff --git a/a1/program.c b/a1/program.c
index 9203077..a6bbd5b 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -115,7 +115,7 @@ int main(){
   }
   need = 0;
   for (int j = 0; j < s; j = j + 3){
-    if (number[j + 1] > 12  number[j + 1] < 0  number[j] < 1  number[j] > 31  number[j + 2] < 1900  number[j + 2] > 2100){
+    if (number[j + 1] > 12 && number[j + 1] < 0 && number[j] < 1 && number[j] > 31 && number[j + 2] < 1900 && number[j + 2] > 2100){
       number[j] = 0;
       number[j + 1] = 0;
       number[j + 2] = 0;