#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 (years > 10)
     {
         printf("15%%");
     }
     return 0;
}