#include <bits/stdc++.h>
using namespace std;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int n;
    cin>>n;
    vector<int> v(2*n);
    for (int i=0; i< 2*n; ++i) cin>>v[i];
    vector<long long> sum(2 * n + 1);
    for (int i = 2*n-2; i >= 0; i -= 2) {
        sum[i] = v[i] + sum[i+2];
    }    
    long long ans = 1e18;
    long long pref = v[0];
    for (int i = 1; i <= n; ++i) {
        ans = min(ans, (v[0] + v[i]) * (pref + sum[2 * i]));
        pref += v[i];
    }  
    cout << ans << '\n';
    return 0;
}