#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ff first
#define ss second
#define pb push_back
#define mp make_pair

typedef long long llong;
typedef pair<int, int> pii;

void solve() {

	int n, m;
	cin >> n >> m;

	llong hor_cuts = n - 1;
	llong ver_cuts = (llong)n * (m - 1);

	llong ans = hor_cuts + ver_cuts;

	cout << ans;
	
}

int main() {

	ios_base::sync_with_stdio(0);
	cin.tie(0);

	#ifdef LOCAL
		ifstream in("in");
		cin.rdbuf(in.rdbuf());
	#endif

	solve();

	return 0;

}