#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 int m,n;
    cin>>m>>n;
    if(m==1 && n==1){
        cout<<0;
    }
    else{
        cout<<m+n-2;
    }
    return 0;
}