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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long long int n, m;
    cin >> n >> m;
    long long int a = n - 1;
    long long int b = m - 1;
    cout << min(b * n + a, a * m + b) << "\n";
    return 0;
}