#include <bits/stdc++.h>
using namespace std;
#define MAX_N 100001
typedef long long ll;
ll s[MAX_N];
vector<ll> vp, vb;
int N, K;

template<typename It>
ll my_next_permutation(It begin, It end){
    if (begin == end) return false;

    It i = begin;
    ++i;
    if (i == end) return false;

    i = end;
    --i;

    while (true){
        It j = i;
        --i;

        if (*i < *j){
            It k = end;

            while (!(*i < *--k)) /* pass */;

            iter_swap(i, k);
            reverse(j, end);

            // sumを更新する
            for(int k=distance(begin, i)-1; k<N-1; k++){
                if(k == -1) s[k+1] = abs(vp[k+1] - vb[k+1]);
                else s[k+1] = s[k] + abs(vp[k+1] - vb[k+1]);
            } 

            return s[N-1];
        }

        if (i == begin){
            reverse(begin, end);

            // sumを更新する
            s[0] = abs(vp[0] - vb[0]);
            for(int k=0; k<N-1; k++) s[k+1] = s[k] + abs(vp[k+1] - vb[k+1]); 

            return s[N-1];
        }
    }
}

int main(void){
    cin >> N >> K;
    for(int i=0; i<N; i++){
        int p; cin >> p;
        vp.push_back(p);
    }
    for(int i=0; i<N; i++){
        int b; cin >> b;
        vb.push_back(b);
    }
    // sumを更新する
    s[0] = abs(vp[0] - vb[0]);
    for(int k=0; k<N-1; k++) s[k+1] = s[k] + abs(vp[k+1] - vb[k+1]);
    ll ret = s[N-1];
    K--;

    for(int k=0; k<K; k++){
        ret += my_next_permutation(vp.begin(), vp.end());
    }
    cout << ret << endl;
}