#include<bits/stdc++.h>
#define rep(i,x,y) for(i=x;i<y;i++)
#define pb(f) push_back(f)
#define ll long long
#define mp make_pair
#define fi first
#define se second
#define mod 1000000007
using namespace std;

//#include<windows.h>
//FILE *fin = freopen("33.in","r",stdin);  FILE *fout = freopen("out.txt","w",stdout);
using namespace std;
typedef pair<ll, ll> pii;
typedef vector<ll > vi;
typedef vector< pii > vpii;

const int N=2e5+5;
map<pii ,ll>M;
/*ll rec(ll n,ll m)
{
	if(n==1)
	{
		if(m==1) return 0;
		return m-1;
	}
	if(m==1)
	{
		return n-1;
	}
	if(M.count({n,m})) return M[{n,m}];
	if(n>=m)
	{
		M[{n,m}]=1+rec(n/2,m)+rec(n-n/2,m);
	}
	
	
}*/
int main()
{
	ll n,m;cin>>n>>m;
	cout<<min(n*(m-1)+n-1,m*(n-1)+m-1);
	
}