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