#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;
}