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


int main() {
   long long n, m;
    while(cin >> n >> m){
        if(n == 1 || m == 1){
            cout << (m-1) + (n-1) << endl;
            continue;
        }
        long long ans1 = (n-1) + n * (m-1), ans2 = (m-1) + m * (n-1);
        cout << min(ans1, ans2) << endl;
    }
    return 0;
}