diff --git a/cv3/program.c b/cv3/program.c
index a099af5..f01429f 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -30,6 +30,11 @@ int main() {
         }
         if (line[0] == '+' || line[0] == '-' || line[0] == '*' || line[0] == '/') {
             input =+ 2;
+            if (a == 1){
+                printf("no enough operands");
+                vys = 1;
+                break;
+            }
             if (line[0] == '+') {
                 number[a - 2].cislo = number[a - 2].cislo + number[a - 1].cislo;
                 a--;