#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,p[707],c[707],ans=1e18;
signed main(){
    freopen("sweet.in","r",stdin);
    freopen("sweet.out","w",stdout);
    cin>>n;
    int bj=0;
    for(int i=1;i<n;i++){
        cin>>p[i];
        if(p[i]!=1){
            bj=1;
        }
    }
    for(int i=1;i<=n;i++){
        cin>>c[i];
        ans=min(ans,c[i]);
    }
    if(!bj){
        cout<<ans*2;
        return 0;
    }
    ans=1e18;
    for(int i=1;i<=n;i++){
        ans=min(ans,c[i]*(n-i+1));
    }
    cout<<ans;
    return 0;
}