#include <algorithm>

#include <cassert>

#include <cmath>

#include <cstdio>

#include <cstring>

#include <iostream>

#include <map>

#include <queue>

#include <set>

#include <string>

#include <tuple>

#define LOCAL_DEBUG

using namespace std;

typedef pair<int, int> MyPair;

int main() {

#ifdef LOCAL_DEBUG

    freopen("C:\\Users\\Iris\\source\\repos\\ACM\\ACM\\input.txt", "r", stdin);

    //freopen("C:\\Users\\Iris\\source\\repos\\ACM\\ACM\\output.txt", "w", stdout);

#endif // LOCAL_DEBUG

    int T;

    int m, n;

    for (int ti = ;cin>>m>>n; ti++) {

        if (m > n)swap(m, n);

        cout << (m - ) * n + (n - ) << endl;

    }

    return ;

}