#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>

#include <iostream>
#include <complex>
#include <string>
#include <algorithm>
#include <numeric>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>

#include <functional>
#include <cassert>

typedef long long ll;
using namespace std;

#ifndef LOCAL
#define debug(x) ;
#else
#define debug(x) cerr << __LINE__ << " : " << #x << " = " << (x) << endl;

template <typename T1, typename T2>
ostream &operator<<(ostream &out, const pair<T1, T2> &p) {
  out << "{" << p.first << ", " << p.second << "}";
  return out;
}

template <typename T>
ostream &operator<<(ostream &out, const vector<T> &v) {
  out << '{';
  for (const T &item : v) out << item << ", ";
  out << "\b\b}";
  return out;
}
#endif

#define mod 1000000007 //1e9+7(prime number)
#define INF 1000000000 //1e9
#define LLINF 2000000000000000000LL //2e18
#define SIZE 300010

template<typename T>
struct LiChaoTree {
  using Line = pair<T, T>; // first * x + second

  int segn2;
  vector<Line> data;
  vector<T> X;

  template<typename S>
  LiChaoTree(vector<S> pos) {
    int N = pos.size();
    for (segn2 = 1; segn2 < N; segn2 *= 2);
    data.assign(segn2 * 2, {0, INF});
    X.assign(segn2, INF);
    for (int i=0; i<pos.size(); i++)
      X[i] = pos[i];
  }

  inline T f(Line line, T x) {
    return line.first * x + line.second;
  }

  void addLine(int a, int b, Line line, int l = 0, int r = -1, int k = 0) {
    if (r == -1) r = segn2;
    int m = (l + r) / 2;

    if (r <= a || b <= l) return;
    if (l < a || b < r) {
      addLine(a, b, line, l, m, k*2+1);
      addLine(a, b, line, m, r, k*2+2);
      return;
    }
    if (data[k].second == INF) { //isNull
      data[k] = line;
      return;
    }

    bool fl = f(line, X[l])   < f(data[k], X[l]);
    bool fm = f(line, X[m])   < f(data[k], X[m]);
    bool fr = f(line, X[r-1]) < f(data[k], X[r-1]);

    if (fl == fr) {
      if (fl) data[k] = line;
      return;
    }
    if (fm) swap(data[k], line);

    if (fl ^ fm) addLine(a, b, line, l, m, 2*k+1);
    else addLine(a, b, line, m, r, 2*k+2);
  }

  void addLine(Line line) { addLine(0, segn2, line); }

  T query(int k) {
    T x = X[k], res = LLINF;
    k += segn2-1;

    while(1){
      if (data[k].second != INF) //isNotNull
        res = min(res, f(data[k], x));
      if (!k) break;
      k = (k - 1) / 2;
    }

    return res;
  }
};


int main(){
  int N, A[SIZE], X[SIZE], Y[SIZE];
  ll dp[SIZE];

  scanf("%d", &N);

  for (int i=0; i<N; i++) scanf("%d", A+i);
  for (int i=0; i<N; i++) scanf("%d", X+i);
  for (int i=0; i<N; i++) scanf("%d", Y+i);

  vector<ll> vec;
  map<ll, int> dic;
  for (int i=0; i<N; i++) vec.push_back(X[i]);
  for (int i=0; i<N; i++) vec.push_back(A[i]);
  sort(vec.begin(), vec.end());
  vec.erase(unique(vec.begin(), vec.end()), vec.end());

  debug(vec);

  LiChaoTree<ll> tree(vec);
  for (int i=0; i<vec.size(); i++)
    dic[vec[i]] = i;

  dp[0] = 0;
  for (int i=0; i<N; i++) {
    tree.addLine(0, dic[X[i]], {-1, Y[i] + dp[i] + X[i]});
    tree.addLine(dic[X[i]], vec.size(), {1, Y[i] + dp[i] - X[i]});

    dp[i+1] = tree.query(dic[A[i]]);
    debug(dp[i+1]);
  }

  cout << dp[N] << endl;

  return 0;
}