/* -*- coding: utf-8 -*-
 *
 * 3254.cc:  No.3254 Xor, Max and Sum - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

/* typedef */

using ll = long long;

/* global variables */

/* subroutines */

/* main */

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

  if (n == 1) { puts("0"); return 0; }
  if (! (n & 1)) { printf("%lld\n", (ll)m * n); return 0; }

  int msi = 0;
  while ((1 << (msi + 1)) <= m) msi++;
  
  ll sum = 0;
  int f = 0;
  for (int i = msi, bi = 1 << i; i >= 0; i--, bi >>= 1) {
    if (m & bi) {
      sum += (ll)bi * (n - 1);
      if (f < n) f++;
    }
    else {
      sum += (ll)bi * ((f / 2) * 2);
    }
  }
  
  printf("%lld\n", sum);
  
  return 0;
}