#include<stdio.h>
int main()
{
    int y;
    scanf("%d",&y);
    if(1<=y<=5)
    {   
        printf("5%");
    }
    else if(6<=y<=10)
    {   
        printf("10%");
    }
    else if(y>=11)
    {   
        printf("15%");
    }
    else
        printf("Invalid Input")
    return 0;
}