use std::cmp::min;

fn main() {
    let mut abs = String::new();
    std::io::stdin().read_line(&mut abs).ok();
    let abs: Vec<isize> = abs.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let a = abs[0];
    let b = abs[1];
    let s = abs[2];

    let mut result: isize = 1000;
    if (a-s).abs() <= (b-s).abs() {
        result = (a-s).abs()+s.abs();
    } else if s == 1 {
        result = if a == 0 { 2 } else { a };
    } else {
        //b -> s , s -> a, a -> 0
        result = min(result, (b-s).abs() + (s-a).abs() + a.abs() + if a == 0 { 1 } else { 0 });
        //b -> s, s -> 1, a -> 1, 1 -> 0
        result = min(result, (b-s).abs() + s  - 1 + (a-1).abs() + 1);
    }
    println!("{}", result);
}