#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 int n,m; 
    cin >> n >> m;
    long long int result = min(((n-1)+(m-1)*n),((m-1)+(n-1)*m));
    cout <<result;
    return 0;
}