#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
using pii=pair<int,int>;
using vi=vector<int>;
using ll=long long;
using vl=vector<ll>;
#define pb push_back
#define all(a) begin(a),end(a)

const int N=300010,MOD=1e9+7;
const char en='\n';
const ll LLINF=1ll<<60;

ll n, m, sol = LLINF;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m;
	for (long long int x = 0; x <= n + m; x++) {
		long long int y = max((n - 3 * x + 3) / 4, (m - 4 * x + 2) / 3);
		sol = min(sol, x + max(y, 0));
	}
	cout << sol * 2 - 1 << endl;
	return 0;
}

answer.code: In function ‘int main()’:
answer.code:24:39: error: no matching function for call to ‘max(long long int&, int)’
   24 |                 sol = min(sol, x + max(y, 0));
      |                                    ~~~^~~~~~
In file included from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/istream:38,
                 from /usr/include/c++/11/sstream:38,
                 from /usr/include/c++/11/complex:45,
                 from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:254:5: note: candidate: ‘template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)’
  254 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:254:5: note:   template argument deduction/substitution failed:
answer.code:24:39: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘int’)
   24 |                 sol = min(sol, x + max(y, 0));
      |                                    ~~~^~~~~~
In file included from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/istream:38,
                 from /usr/include/c++/11/sstream:38,
                 from /usr/include/c++/11/complex:45,
                 from /usr/include/c++/11/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:54,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algobase.h:300:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)’
  300 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/11/bits/stl_algobase.h:300:5: note:   template argument deduction/substitution failed:
answer.code:24:39: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long int’ and ‘int’)
   24 |                 sol = min(sol, x + max(y, 0));
      |                                    ~~~^~~~~~
In file included from /usr/include/c++/11/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algo.h:3461:5: note: candidate: ‘template<class _Tp> constexpr _Tp std::max(std::initializer_list<_Tp>)’
 3461 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/11/bits/stl_algo.h:3461:5: note:   template argument deduction/substitution failed:
answer.code:24:39: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   24 |                 sol = min(sol, x + max(y, 0));
      |                                    ~~~^~~~~~
In file included from /usr/include/c++/11/algorithm:62,
                 from /usr/include/x86_64-linux-gnu/c++/11/bits/stdc++.h:65,
                 from answer.code:1:
/usr/include/c++/11/bits/stl_algo.h:3467:5: note: candidate: ‘template<class _Tp, class _Compare> constexpr _Tp std::max(std::initializer_list<_Tp>, _Compare)’
 3467 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/11/bits/stl_algo.h:3467:5: note:   template argument deduction/substitution failed:
answer.code:24:39: note:   mismatched types ‘std::initializer_list<_Tp>’ and ‘long long int’
   24 |                 sol = min(sol, x + max(y, 0));
      |                                    ~~~^~~~~~