#include<bits/stdc++.h>
using namespace std;
#define int long long 
int ans;
int n;
int f;
int a[701],p[701];
signed main(){
    freopen("sweet.in","r",stdin);
    freopen("sweet.out","w",stdout);
    cin>>n;
    for(int i=1;i<n;i++){
        cin>>p[i];
        if(p[i]==i&&f!=-1)f=1;
        else if(p[i]==1&&f!=-1)f=2;
        else if((f==1&&p[i]!=i)||(f==2&&p[i]!=1))f=-1;
    }
    int mi=INT_MAX*1e6;
    for(int i=1;i<=n;i++){
        cin>>a[i],mi=min(mi,a[i]);
    }
    if(f==1){
        ans=2e12;
        for(int i=1;i<=n;i++){
            ans=min(ans,a[i]*(n-i+1));
        }
        cout<<ans<<'\n';
    }else if(f==2)cout<<2*mi<<'\n';
    fclose(stdin);
    fclose(stdout);
    return 0;
}