#include <stdio.h>

int main(){
    int hour;
    scanf("%d", &hour);
    if (hour >=0 && hour <=11){
        printf("Good morning"); 
        } else if (hour >= 12 && hour <=16);{
            printf("Good afternoon");
        }else if (hour>=17 && hour<=23) {
            printf("Good morning");
            } else {
                printf("Invalid input");
            }
                return 0;
        }