#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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