#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; }