#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    long long N,M;
    cin>>N>>M;
    
    long long ans =min(  N*(M-1)+ N-1 , M*(N-1) + M-1 );
    cout<<ans;
    return 0;
}