#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
int n; cin >> n;
vector<int> x(n), y(n), a, b;
for(int i=0; i<n; i++) {
cin >> x[i];
for(int j=0; j<x[i]; j++) a.push_back(i);
}
for(int i=0; i<n; i++) {
cin >> y[i];
for(int j=0; j<y[i]; j++) b.push_back(i);
}
cout << x[0]*(n-2);
// int ans=-1e12;
// for(int j=0; j<b.size(); j++) {
// int cur=0, aa=0;
// for(int i=j; i<b.size(); i++) {
// if(a[aa] < b[i]) cur++;
// else if(a[aa] > b[i]) cur--;
// aa++;
// }
// for(int i=j-1; i>=0; i--) {
// if(a[aa] < b[i]) cur++;
// else if(a[aa] > b[i]) cur--;
// aa++;
// }
// ans=max(ans, cur);
// }
// cout << ans;
return 0;
}
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