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

#define _ ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define P(a,n) for(int i=a;i<=n;i++) cout<<a[i]<<" "; 
#define bp(n) __builtin_popcount(n);
#define D 1000000007
#define pb push_back
#define ci(x) cin>>x;
#define c2(x,y) cin>>x>>y;
#define c3(x,y,z) cin>>x>>y>>z;
#define p2(x,y) cout<<x<<" "<<y<<endl;
#define p3(x,y,z) cout<<x<<" "<<y<<" "<<z<<endl;
#define co(x) cout<<x<<endl;
#define r0 return 0;
#define r1 return 1;
#define fi first
#define se second
#define mp make_pair

typedef vector<int> VI;
typedef long double ld;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<pii> VII;
typedef vector<ll> VL;
typedef vector<pll> VLL;
ll tpp = 9e18; int tp = 1e9;
ll n,m;
int main()
{
	_
	c2(n,m);
	if(n==1 or m==1)
	{
		co(max(n,m)-1);
		r0;
	}
	ll res = (n-1) + (m-1)*(n);
	ll res2 = (m-1) + (n-1)*(m);
	co(min(res,res2));
	r0;
}