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


int main() {
    long long a,b;
    cin >> a >> b;
    long long f = (a-1) + a*(b-1);
    long long c = (b-1) + b*(a-1);
    if(f>c)
        cout << c;
    else
        cout << f;
    return 0;
}