#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 m,n,s1,s2;
    cin>>m>>n;
    s1 = m-1 + m*(n-1);
    s2 = n-1 + n*(m-1);
    if(s1>s2)
        cout<<s2;
    else
        cout<<s1;
    return 0;
}