#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define N 1000001
#define hg ios_base::sync_with_stdio(0);cin.tie(0)
#define ff first
#define ss second
#define gcd __gcd
#define inf (1<<30)
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
#define all(xx) xx.begin(),xx.end()
#define bitcit __builtin_popcount
#define mset(x,y) memset(x,y,sizeof(x))
#define INF 1e18
#define ll long long
#define endl "\n"

ll minn(ll a,ll b)
{
	if(a!=0&&a<=b)
	return a;
	return b;
}

int main() {
    hg;
    int t;
    ll n,m;
    int i,j;
    cin>>n>>m;
   	ll ans1,ans2,ans=0;
   	ans1=((m-1)*n)+n-1;
    ans2=((n-1)*m)+m-1;
    ans=minn(ans1,ans2);
    cout<<ans;
	return 0;
}