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

    let mut cnts = vec![3; n+1];
    cnts[n] = 0;
    let mut availables = vec![false; n+1];
    for i in 1.. {
        let val = i * (i+1) / 2;
        if val > n { break; }
        cnts[n-val] = 1;
        availables[val] = true;;
    }
    if cnts[0] == 1 {
        println!("1");
        return;
    }
    for i in 1..n {
        if cnts[i] == 1 && availables[i] {
            println!("2");
            return;
        }
    }
    println!("3");
}