#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
vector <ll> X(n), Y(n);
for (int i = 0; i < n; i++)
cin >> X[i];
for (int i = 0; i < n; i++)
cin >> Y[i];
cout << max(0LL, (ll)(n-2) * Y[n-1]) << '\n';
}
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