#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 */  
    
    unsigned long long n, m;
    cin >> n >> m;
    
    unsigned long long cuts1, cuts2;
    
    cuts1 = n - 1 + (m - 1) * n;
    cuts2 = m - 1 + (n - 1) * m;
    cout << min (cuts1, cuts2) << endl;
    return 0;
}