/* -*- coding: utf-8 -*-
 *
 * 1869.cc:  No.1869 Doubling? - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

typedef long long ll;

/* global variables */

/* subroutines */

/* main */

int main() {
  int n, m;
  scanf("%d%d", &n, &m);

  if (n <= 31) m = min(m, 1 << (n - 1));

  ll sum = 0;
  int k = 0;
  while (m > 1) {
    sum += m;
    k++;
    m = (m & 1) ? (m + 1) / 2 : m / 2;
  }

  sum += n - k;

  printf("%lld\n", sum);
  return 0;
}