#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 
    {
    printf ("15%%");
    }
    return 0;
}