#include<stdio.h>
struct total
{
    float BOOK;
};
  int main()
  {
      struct total find;
      scanf("%f",&find.BOOK);
      
  if(find.BOOK<=0)
  {
      printf("Invalid input");
  }
  else if(1>=find.BOOK && find.BOOK<=5)
  {
      printf("10%%");
  }
  else if(6>=find.BOOK && find.BOOK<=10)
  {
      printf("15%%");
  }
  else(BOOK<=10) {
      printf("20%%");
  }
  return 0;
  }