#include<bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    ll A,B; cin>> A >> B;
    if(A == 0 && B == 0) cout << 0 << endl;
    else if(A == 0) cout << 2*B-1 << endl;
    else if(B == 0) cout << 2*A-1 << endl;
    else {
        ll x = min(A,B);
        A -= x;
        B -= x;
        cout << 2*x + max(0LL,2*A-1) + max(0LL,2*B-1) << endl;
    }
}