#include<bits/stdc++.h>
using namespace std;
int a[1005],b[1005];
struct cmp{
      bool operator()(int x,int y)
    {
        return x<y;
    }
};
int main(){
    int n;
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        scanf("%d",&a[i]);
    }
    for(int i=0;i<n-1;i++){
        scanf("%d",&b[i]);
    }
    priority_queue<int,vector<int>,cmp> q;
    int num=0;
    int geshu=0;
    int flag=0;
    for(int i=0;i<n-1;i++){
        q.push(a[i]);
        if(num<b[i]){
            if(geshu<3){
                geshu++;
                num+=q.top();
                q.pop();
                if(num<b[i]){
                    flag=1;
                    break;
                }
                num-=b[i];
            }
            else{
                flag=1;
                break;
            }
        }
        else{
            num-=b[i];
        }
    }
    q.push(a[n-1]); 



    if(geshu!=3&&!flag){
        while(geshu!=3){
            num+=q.top();
            q.pop();
            geshu++;
        }
    }
    if(flag){
        printf("-1\n"); 
    } 
    else{
        printf("%d\n",num);     
    }
}