#include <bits/stdc++.h>
#define ll long long
#define int long long
#define Sayan ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define Int(a,x) a+1 , a+1+x
#define sz() size()
#define F first
#define S second
#define pb push_back
#define yes cout << "YES\n"
#define no cout << "NO\n"
#define pii pair<ll,ll>
using namespace std ;

const ll N = 2e5+5;
const ll INF = 1e18;
const ll mod = 1e9+7;
ll n,m,cnt;
signed main () {
  Sayan;
  int tt=1;
//  cin>>tt;
  while(tt--){
    cin >> n >> m;
    cnt += (n * m) * ((n / 2) + (m / 2) + 1);
    if (max(n,m) % 2 != 0) {
      cnt += 2 * min(n,m);
    } 
    cout << cnt;
  }
}
