fn main() {
    input! {
        n: usize,
        k: usize,
        a: [i64; n],
        b: [i64; n],
    }
    let dist = |a: &[i64], b: &[i64]| -> i64 {
        a.iter().zip(b.iter()).fold(0, |s, p| s + (*p.0 - *p.1).abs())
    };
    let mut a = a;
    let mut ans = 0;
    let mut sum = dist(&a, &b);
    for _ in 0..k {
        ans += sum;
        if let Some(x) = a.windows(2).rposition(|a| a[0] < a[1]) {
            sum -= dist(&a[x..], &b[x..]);
            let y = a.iter().rposition(|p| *p > a[x]).unwrap();
            a.swap(x, y);
            a[(x + 1)..].reverse();
            sum += dist(&a[x..], &b[x..]);
        } else {
            a.reverse();
            sum = dist(&a, &b);
        }
    }
    println!("{}", ans);
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------