#include <bits/stdc++.h>
using namespace std;

int main()
{
	long n,m;
	cin >> n >> m;
    unsigned long long  ans1 = (n-1) + n * (m-1);
    unsigned long long  ans2 = (m-1) + m * (n-1);
    if(ans1 < ans2)
	   cout << ans1;
    else
       cout << ans2;
	return 0;
}