#![allow(unused_imports)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;
use std::ops::Bound::*;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let v = read_vec::<usize>();
    let (n, k) = (v[0], v[1]);
    let mut a = read_vec::<i64>();
    a.sort();
    let mut b = a.iter().map(|&x| (x - a[0]).abs()).collect::<Vec<_>>();
    b.sort();
    let mut ans1 = 0;
    for i in 0..k {
        ans1 += b[i];
    }
    for i in k..n {
        ans1 -= b[i];
    }
    let mut b = a
        .iter()
        .map(|&x| (a[a.len() - 1] - x).abs())
        .collect::<Vec<_>>();
    b.sort();
    let mut ans2 = 0;
    for i in 0..k {
        ans2 += b[i];
    }
    for i in k..n {
        ans2 -= b[i];
    }
    println!("{}", min(ans1, ans2));
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}