#include <stdio.h>
int main()
{
    int a;
    scanf("%d",&a);
    if (a<0)
    {
        printf("Invalid input");
    }
    else if (a>75)
    {
        printf("Great job!");
    }
    else if(a>=50)
    {
        printf("God effort!");
    }
    else
    {
        ptintf("keep trying!");
    }
}