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


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