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


int main() {
    long long m,n;
    cin >> n >> m;
    long long T=0;
    if(n<=m){
        T=n-1;
        T+=(m-1)*n;
    }
    else{
        T=m-1;
        T+=m*(n-1);
    }
    cout << T<< endl;
    
    return 0;
}