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