#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define Elkahraba_mesh_2at3a      \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define ll long long
#define double long double
#define int long long
#define ull unsigned long long
#define el "\n"
#define endl "\n"
#define num_of_digits(x) int(log10(x)) + 1
#define ordered_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>

const double PI = 3.14159265358979323846;
const ll N = 1e7, MOD = 1e9 + 7, INF = 1e17;
void fileIO()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}

void Eft7_elkahraba()
{
    int n, h, v;
    cin >> n >> h >> v;
    cout << 4 * max({h * v, (n - h) * v, (n - v) * h, (n - v) * (n - h)});
}
signed main()
{
    Elkahraba_mesh_2at3a;
    fileIO();
    int _t = 1;
    // cin >> _t;
    while (_t--)
    {
        Eft7_elkahraba();
    }
}