use proconio::input;

fn main() {
    input! {
        n: usize,
        c: [i64; n]
    }
    
    let min = c.iter().min().unwrap();
    let max = c.iter().max().unwrap();
    
    let mut ans = i64::MAX;
    
    ans = ans.min(max.abs() + (max-min).abs() + min.abs());
    
    println!("{}", ans);
}