#include <stdio.h>

int main() 
{
    int a;
    scanf("%d",&a);
    if(a>85)
    {
        printf("A grade\n");
    }
    if(60<a & a<=85)
    {
        printf("B+ grade\n");
    }    
    if(40<a & a<=60)
    {
        printf("C grade\n");
    }
    if(a<=40)
    {
        printf("fail\n");
    }

    return 0;
}

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