#include <stdio.h>
int main()
{
	int A;
    scanf("%d",&A);
	printf("Enter the MARKS: %d\n",A);
    if (A>=86 && A<=100)
    printf("GRADE RECEIVED IS A ");
    else if (A>=61 && A<=85)
    printf("GRADE RECEIVED IS B+ ");
    else if (A>=41 && A<=60)
    printf("GRADE RECEIVED IS B ");
    else if (A>=31 && A<=40)
    printf("GRADE RECEIVED IS C ");
    else
    printf("FAIL");
    return 0;
}