macro_rules! read_line_to_tuple {
    ( $( $t:ty ),* ) => {{
        let mut input = String::new();
        std::io::stdin().read_line(&mut input).unwrap();
        let mut iter = input.split_whitespace();
        ( $( iter.next().unwrap().parse::<$t>().unwrap() ),* )
    }};
}

use std::cmp;

fn main() {
    let n = read_line_to_tuple!(usize);

    let mut ans = 0;
    for a in 0..=(n / 5) {
        for b in 0..=cmp::min(a, (n - a * 5) / 2) {
            if (n - a * 5 - b * 2) % 3 == 0 {
                ans += 1;
            }
        }
    }
    println!("{}", ans);
}