#include<stdio.h>
void main()
{
    int x;
    scanf("%d",&x);
    if(x==0)
    {
        printf("Invalid Input");
    }
    else
    {
        
        switch(x)
        {
             
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
            printf("5%");
            break;
            case 6:
            case 7:
            case 8:
            case 9:
            case 10:
            printf("10%");
        
          
        
        }
        if(x>10)
        {
            printf("15%");
        }
    
    }
}