#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,ans;
    cin>>n>>m;
    if(m>n)
        ans=(n-1)+(n)*(m-1);
    else ans=(m-1)+(n-1)*(m);
    cout<<ans;
    return 0;
}