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 cands = vec![false; n+1];
    for i in 1.. {
        let val = i * (i+1) / 2;
        if val > n { break; }
        if val == n {
            println!("1");
            return;
        }
        cands[n-val] = true;
    }
    for i in 1.. {
        let val = i * (i+1) / 2;
        if val > n { break; }
        if cands[val] {
            println!("2");
            return;
        }
    }
    println!("3");
}