#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T, class U> using Pa = pair<T, U>;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int A,B;
    cin >> A >> B;
    if(A>B) swap(A,B);
    if(A==1 && B==1) cout << 1 << "\n";
    else if(A==1 || B==1) cout << 2 << "\n";
    else{
        B--;
        cout << 2*max(A,B) << "\n";
    }
}