#include <bits/stdc++.h>
using namespace std;
#define lint long long int
int main(){
    int n;
    cin>>n;
    lint sum1=0;
    lint sum2=0;
    lint a;
    for(int i=0;i<n;i++){
        cin>>a;
        sum1=a;
    }
    for(int i=0;i<n;i++){
        cin>>a;
        sum2+=a;
    }
    lint sum3=0;
    lint sum4=0;
    for(int i=1;i<=sum1;i++){
        sum3+=i;
    }
    for(int i=1;i<=sum2;i++){
        sum4+=i;
    }
    //cout<<sum1<<" "<<sum2<<" "<<sum3<<" "<<sum4<<endl;
    cout<<sum3*sum4;
}
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