diff --git a/cv3/program.c b/cv3/program.c
index 7b9a5ac..30ad455 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -2,7 +2,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <ctype.h>
- /////////////@@@@@@@@@@@@@@
+///@
 #define STACK_SIZE 500
 
 struct Stack
@@ -31,7 +31,7 @@ float pop_stack(struct Stack* stack)
 }
 int count_stack(struct Stack* stack)
 {
-
+  return stack->size;
 }
 
 void print_stack(struct Stack* stack)
@@ -62,6 +62,12 @@ int main()
           float op1, op2, rez;
           if(c=='+'||c=='-'||c=='/'||c=='*')  
           {
+              if(count_stack(&mystack)<2)
+              {
+                  printf("not enough operands\n");
+                  err=3;
+                  break;
+              }
               op2=pop_stack(&mystack);
               op1=pop_stack(&mystack);
               switch(c)
@@ -97,9 +103,8 @@ int main()
             print_stack(&mystack);
           }
       }  
-    else {
-        break;
-    }
+      else break;
+
     }while(1);
     if(!err)
         printf("no input\n");
@@ -108,4 +113,3 @@ int main()
 
 
 
-