fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut ans = 0;

    for i in 0..=n / 5 {
        for j in 0..=i {
            for k in 0..=n / 3 {
                if i * 5 + j * 2 + k * 3 == n {
                    ans += 1;
                }
            }
        }
    }

    println!("{}",ans);
}