#include <bits/stdc++.h>
#define pb(x) push_back(x)
#define bug cout<<"HERE"<<endl;
#define SSTR( x ) static_cast< std::ostringstream & >( \
        ( std::ostringstream() << std::dec << x ) ).str()
#define fast 	ios_base::sync_with_stdio(0); cin.tie(0);
#define FOR(i,n) for(int i=0;i<n;++i)
#define FOR2(i,x,n) for(int i=x;i<n;++i)
#define FOR3(i,n) for(int i=n;i>=0;++i)
#define inp freopen("input.txt", "r", stdin);
#define out freopen("output.txt", "w", stdout);
#define PI = acos(-1.0);
using namespace std;

typedef long long ll;
typedef vector<int> vi;


int main() {

	ll n , m ; cin >> n >> m ;
	cout << min (n - 1 + ((m - 1) * (n)) , m - 1 + (n - 1) * (m)) << "\n";

	return 0;
}