#include<stdio.h>
intmain()
{
   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 if (years > 10)
      printf("15%%");
      return 0;
}