#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int a, b;
    cin >> a >> b;

    if (a > b) swap(a, b);

    int r = min(a + b, a * 2 + 1);

    cout << r - 1 << endl;

    return 0;
}