#include<stdio.h>
int main (){
    int years;
    scanf("%d", &years)
    if (years <=1);
    printf("Invalid input");
    else if(years >= 1 &&  years <=5)
    printf("5%%");
    else if(years >= 6 && years <=5)
    printf(10%%);
    else
    printf("15%%");
    return 0;
    
}