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