#include<stdio.h>
int main()
{
    int a,b,c,d,e,sum,avg;
    scanf("%d\n",&a);
    scanf("%d\n",&b);
    scanf("%d\n",&c);
    scanf("%d\n",&d);
    scanf("%d",&e);
    sum=a+b+c+d+e;
    avg=sum/5;
    if(avg>=90)
    {
        printf("outstanding");
    }
    else if(avg>=70&&avg<90)
    {
        printf("Excellent");
    }
    else if(avg>=50&&avg<70)
    {
        printf("good");
    }
    else if(avg<50)
    {
        prinf("Fail")
    }
    else
    {
        printf("invalid input")
    }
    
    return 0;
}