#pragma GCC optimize("Ofast", "unroll-loops")

// #define TEST

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>

using namespace std;

#define ll long long

int main(void){
    int A, B;
    cin >> A >> B;
    int res = 0; int tmp = 2;
    while (tmp--){
        if (B <= A - 1) res = max(res, B * 2);
        else res = max(res, 2 * (A - 1) + 1);
        swap(A, B);
    }
    cout << res << endl;
    return 0;
}