#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <cmath>
#include <sstream>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define all(c) (c).begin(), (c).end()
#define loop(i,a,b) for(ll i=a; i<ll(b); i++)
#define rep(i,b) loop(i,0,b)
#ifdef DEBUG
#define dump(...) (cerr<<#__VA_ARGS__<<" = "<<(DUMP(),__VA_ARGS__).str()<<" ["<<__LINE__<<"]"<<endl)
struct DUMP:ostringstream{template<class T>DUMP &operator,(const T&t){if(this->tellp())*this<<", ";*this<<t;return *this;}};
#else
#define dump(...)
#endif

int main(){
    ll h,w;
    while(cin>>h>>w){
        if(h==w){
            if(w&1){
                cout << (h/2)*(h/2) + h/2 + 1;
            }else{
                cout << (h/2)*(h/2);
            }
        }else{
            if((h&1) ^ (w&1)){
                if(h&1) swap(h,w);
                // h <- E, w <\-O
                cout << h/2*w - h/2;
            } else if(h&1 && w&1){
                cout << w*h/2; // ok
            } else{
                cout << w/2*h/2;
            }
        }
        cout << endl;
    }
}