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

typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<pii> vpii;
typedef unsigned long long llu;

#define author ayushtomar
#define rf freopen("in.txt", "r", stdin)
#define wf freopen("out.txt", "w", stdout)
#define debug(x) cerr<<#x<<" "<<x<<endl;
#define f first
#define s second
#define mp make_pair
#define pb push_back

int main()
{
    ll n,m;
    cin>>n>>m;
    ll x=n-1 + (m-1)*n;
    swap(n,m);
    ll y=n-1 + (m-1)*n;
    cout<<min(x,y);
 return 0;
}