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