#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=2e9+1;
const ll INF=4e18;
const ll dy[8]={-1,0,1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
template <typename T> inline bool chmax(T &a, T b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> inline bool chmin(T &a, T b) {
  return ((a > b) ? (a = b, true) : (false));
}
ll ans=0;
vl b;
ll np(vl &v,ll left){
  ll n=v.size();
  per(i,n-1){
    if(v[i]<v[i+1]){
      int j=n-1;
      while(!(v[i]<v[j]))j--;
      for(int t=i;t<n;t++)left-=abs(v[t]-b[t]);
      swap(v[i],v[j]);
      sort(v.begin()+i+1,v.end());
      for(int t=i;t<n;t++)left+=abs(v[t]-b[t]);
      return left;
    }
  }
  rev(all(v));
  ll ret=0;
  rep(i,n)ret+=abs(v[i]-b[i]);
  return ret;
}
int main(){
  ll n,k;cin >> n>> k;
  if(k==0)cout << 0 << endl,exit(0);
  vl p(n);rep(i,n)cin >> p[i];
  b.resize(n);
  rep(i,n)cin >> b[i];
  ll left=0;rep(i,n)left+=abs(p[i]-b[i]);
  ans+=left;
  k--;
  while(k--){
    ll ret=np(p,left);
    ans+=ret;
    left=ret;
  }
  cout << ans << endl;
}