diff --git a/cv3/program.c b/cv3/program.c
index fdc3c32..68f8026 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -16,6 +16,10 @@ int main(){
     char vstup[STACK_SIZE];
     int counter = 0;
     while(1){
+        if(counter > 10){
+            printf("full stack\n");
+            return 0;
+        }
         if (fgets(vstup, sizeof(vstup), stdin) == NULL) {
             printf("no input\n");
             return 0;