#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;

template <class T> T inline input(string s = ""){
    T _data;
    cout << s;
    cin >> _data;
    return _data;
}

int main(){
    int n = input<int>(), m = input<int>();
    cout << min(n, m) * 2 - 1 - ((n + m) % 2 == 0 && n != m? 1 : 0);
    return 0;
}