#include <bits/stdc++.h>

using namespace std;

#define int long long
#define ld long double
#define el '\n'
#define fi first
#define se second

#define Nine_seconds ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);


void run_case(int tc) {
    int n,h,v;
    cin >> n >>h >> v;
    cout << max({h * v,(n - h) * v,(n - v) * h,(n - v) * (n - h)}) * 4 << el;
}


int32_t main() {
    Nine_seconds        /*Turn Off for Interactive Problems*/

    int _t = 1;
    //cin >> _t;
    for (int i = 1; i <= _t; i++) {
        run_case(i);
        //cout << "\n "[i == _t];
    }
}