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