#include <iostream>
#include <cstdint>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	uint32_t N, M;
	cin >> N >> M;

	uint64_t ans = 0;
	for (; N != 0 && M != 1; --N, M = (M + 1) >> 1)
		ans += M;

	cout << ans + N << '\n';
	return 0;
}