#include <stdio.h>
#include <stdio.h>
int main()
{  int years;
   scanf("%d",&years);
   if (year <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;
}