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