#include<bits/stdc++.h>
#include<unordered_map> 
#define print(v,T) copy(v.begin(), v.end(), ostream_iterator<T>(cout, " "));
#define TATAKAAI ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long
#define el "\n"
#define ell cout<<"\n"
#define forn(i, n) for (int i = 0; i < n; i++)
#define for1(i, n) for (int i = 1; i <= n; i++)
#define forb(i, n) for (int i = n-1; i >= 0; i--)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(),v.rend()
using namespace std;

const ll N = 1000000007;
int dy[] = { 1,-1,0,0,1,-1 };
int dx[] = { 0,0,-1,1,1,-1 };

int main() {
    TATAKAAI;
    int tc = 1;
    //cin >> tc;
    while (tc--) {
        ll n, h, v;
        cin >> n >> h >> v;

        ll ans = max({ h * v, (n - h) * v, (n - v) * h, (n - h) * (n - v) }) * 4ll;
        cout << ans;

    }


    return 0;
}