#include<stdio.h>
int main()
{
    int yearsofService;
    if (scanf("%d",&yearsofService)!=1){
        printf("Invalid Input\n");
        return 0;
    }
    if(yearsofService<1 || yearsofService>40){
        printf("Invalid Input\n");
    }
    else if(yearsofService>=1 && yearsofService<=5){
        printf("5%%\n");
    }
    else if(yearsofService>=6 && yerasofService<=10){
        printf("10%%\n");
    }
    printf("15%%\n");
}