#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define N 505
#define ll long long 
#define mod 1000000007
int main() {
    ll n,m,a,b;
    cin>>n>>m;
    a=(n-1)+n*(m-1);
    b=(m-1)+m*(n-1);
    if(a<b)
          cout<<a<<" ";
    else
         cout<<b<<" ";
    return 0;
}