use std::io;
fn main() {
    let v = input_nums();
    let n = v[0];
    let mut count = 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 {
                    count += 1;
                }
            }
        }
    }

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

fn input_nums() -> Vec<u64> {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    let mut v = Vec::new();
    for n in s.split_whitespace() {
        v.push(n.parse().unwrap());
    }
    v
}