#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long long n, m;

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