#include<stdio.h>
int main()
{
  int years;
  scanf("%d",&yesrs);
  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 && yars <=40)
  {
        printf("15%%";)
  }
   else
   {
       printf("Invalid Input");
   }
   return 0;
}