#include<stdio.h>

int main(){
    
    int index;
    int mark1;
    int mark2;
    
    printf("Enter index number:");
    scanf("%d",&index);
    
    printf("Enter mark1:");
    scanf("%d",&mark1);
    
    printf("Enter mark2:");
    scanf("%d",&mark2);
    
    int avg = (mark1+mark2)/2;
    printf("Average of marks:%d\n",avg);
    
    if(avg>=35){
        printf("Grade : C-");
    }else{
        printf("\nYou are fail idiot.!");
    }

    
    
    
    
    return 0;
}