#include <bits/stdc++.h>
#define fastio ios::sync_with_stdio(false),cin.tie(0)//,cout.tie(0)
int T = 1; using ll = long long; using ff = double;
using pii = std::pair<int,int>;
const int INF = 0x3f3f3f3f;const int mod = 1e9+7;
using namespace std;

ll d1[] = {1,3,6,4};
ll d2[] = {1,2,6,5};

void sol(){
	ll n,m;cin >> n >> m;
	ll ans = 0;
	if(n == 1){
		for(int i = 0;i < m;i++){
			ans += d1[i%4];
		}
	}
	else if(m == 1){
		for(int i = 0;i < n;i++){
			ans += d2[i%4];
		}
	}
	else ans += n*m*6;
	cout << ans;
}

int main() {
	fastio;
	//cin >> T;
	while(T--){ sol(); }
	return 0;
}