#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

typedef long long ll;


int main() {
    int n, m;
    cin >> n >> m;
    ll res = (n - 1);
    res += 1ll * n * (m - 1);
    
    ll res2 = (m - 1);
    res2 += 1ll * m * (n - 1);
    cout << min(res, res2);
    return 0;
}