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 deque = VecDeque::new();
    let mut checked = vec![false; n+1];
    checked[n] = true;
    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 minus_val = i * (i+1) / 2;
                if minus_val > val { break; }
                if minus_val == val {
                    println!("{}", cnt);
                    return;
                }
                let val = val - minus_val;
                if !checked[val] {
                    deque.push_back(val);
                    checked[val] = true;
                }
            }
        }
    }
    println!("3");
}