#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;
}