#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<iomanip>
#include<math.h>
#include<complex>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#include<set>
#include<bitset>
using namespace std;
#define REP(i,m,n) for(int i=(int)m ; i < (int) n ; ++i )
#define rep(i,n) REP(i,0,n)
typedef long long ll;
typedef pair<int,int> pint;
typedef pair<ll,int> pli;
const int inf=1e9+7;
const ll longinf=1LL<<60 ;
const ll mod=1e9+7 ;
template<typename T,const T id>
struct ConvexHullTrick{
    struct Line{
        T a,b;
        Line(T a=0,T b=0):a(a),b(b){}
        T get(T x){return -abs(x-a)*(x-a)*(x-a)-b;}
    };

    struct Node{
        Line l;
        Node *lhs,*rhs;
        Node(Line l):l(l),lhs(nullptr),rhs(nullptr){}
    };

    const T mi,ma;
    Node* root=nullptr;

    ConvexHullTrick(T mi=0,T ma=inf):mi(mi),ma(ma){}
    Node* insert(Node* p,int lb,int ub,Line& l){
        if(!p)return new Node(l);
        if(p->l.get(lb)>=l.get(lb)&&p->l.get(ub)>=l.get(ub))return p;
        if(p->l.get(lb)<=l.get(lb)&&p->l.get(ub)<=l.get(ub)){
            p->l = l;
            return p;
        }
        int mid=(lb+ub)/2;
        if(p->l.get(mid)<l.get(mid))swap(p->l , l);
        if(p->l.get(lb)<=l.get(lb)){
            p->lhs=insert(p->lhs,lb,mid,l);
        }
        else {
            p->rhs=insert(p->rhs,mid+1,ub,l);
        }
        return p;

    }
    void insert(T a,T b){
        Line l(a,b);
        root=insert(root,mi,ma,l);
    }
    T query(Node* p,int lb,int ub,int t){
        if(!p)return id;
        if(lb==ub)return p->l.get(t);
        int mid=(lb+ub)/2;
        if(t<=mid)return max(p->l.get(t),query(p->lhs,lb,mid,t));
        else return max(p->l.get(t),query(p->rhs,mid+1,ub,t));
    }

    T query(T x){
        return query(root,mi,ma,x);
    }
};
int main(){
    int n;
    cin>>n;
    ll a[n],x[n],y[n];
    rep(i,n)cin>>a[i];
    rep(i,n)cin>>x[i];
    rep(i,n)cin>>y[i];
    ConvexHullTrick<ll, -longinf> cht(0,101010);
    ll dp[n+1];
    dp[0]=0;
    rep(i,n){
        cht.insert(x[i],dp[i]+y[i]*y[i]*y[i]);
        dp[i+1]=-cht.query(a[i]);
    }
    cout<<dp[n]<<endl;
}