#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  ll n, m;
  cin >> n >> m;
  ll x = (n <= 40 ? min(1LL << (n - 1), m) : m);
  ll ans = 0;
  while (x > 1) {
    ans += x;
    x = (x + 1) / 2;
    --n;
  }
  ans += n;
  cout << ans << '\n';
  return 0;
}