use std::cmp::min;
use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let a: i64 = itr.next().unwrap().parse().unwrap();
    let b: i64 = itr.next().unwrap().parse().unwrap();
    let c: i64 = itr.next().unwrap().parse().unwrap();

    let x = (a - b).abs();
    let y = (a - c).abs();
    let z = (b - c).abs();
    println!("{}", min(x, min(y, z)))
}