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