#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
const long long MOD = 1000000007;
const long long INF = 9999999999999999;
using ll = long long;
using mint = modint1000000007;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
int main(){
  ll H,W,N;
  cin>>N>>H>>W;
  pair<ll,ll> za[4];
  vector<ll> num(4);
  za[0] = make_pair(1,1);
  za[1] = make_pair(H,W);
  za[2] = make_pair(1,W);
  za[3] = make_pair(H,1);
  ll T = N/4;
  rep(i,4){
    num[i] = T;
  }
  ll nokori = N%4;
  rep(i,nokori){
    num[i]++;
  }
  ll ans = 0;
  rep(i,4){
    for(int k = i+1;k<4;k++){
      ll temp = abs(za[k].first-za[i].first)+abs(za[k].second-za[i].second);
      ans += temp*num[i]*num[k];
    }
  }
  cout << ans << endl;
  return 0;
}