#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<=10)
    printf("10%");
    else
    printf("15%");
    return 0;
}