/*******************************************   saluja123  *************************************************/
#include<bits/stdc++.h>
#define ll long long
#define mod 1000000007
using namespace std;


int main()
{
//	freopen("in.txt","r",stdin);
//	freopen("out.txt","w",stdout);
	ll n,m;
	cin>>n>>m;
	
	cout<<min(m-1+m*(n-1),n-1+(m-1)*n);
	return 0;
}