use std::collections::VecDeque;


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

    let mut used = vec![false; n+1];
    used[n] = true;
    let mut deque = VecDeque::new();
    deque.push_back(n);
    for cnt in 1..=2 {
        let limit = deque.len();
        for _ in 0..limit {
            let val = deque.pop_front().unwrap();
            for i in 1.. {
                let dval = i * (i + 1) / 2;
                if dval > val { break; }
                let idx = val - dval;
                if idx == 0 {
                    println!("{}", cnt);
                    return;
                }
                if used[idx] { continue; }
                used[idx] = true;
                deque.push_back(idx);
            }
        }
    }
    println!("3");
}