private static void solve ( ) {
  int n = nextInt ( ) ;
  long x = nextLong ( ) ;
  long [ ] l = new long [ n + 1 ] ;
  long [ ] p = new long [ n + 1 ] ;
  l [ 0 ] = 1 ;
  p [ 0 ] = 1 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    l [ i ] = 2 * l [ i - 1 ] + 3 ;
    p [ i ] = 2 * p [ i - 1 ] + 1 ;
  }
  System . out . println ( get ( n , x , l , p ) ) ;
}

private static void solve ( ) { int n = nextInt ( ) ; long x = nextLong ( ) ; long [ ] l = new long [ n + 1 ] ; long [ ] p = new long [ n + 1 ] ; l [ 0 ] = 1 ; p [ 0 ] = 1 ; for ( int i = 1 ; i <= n ; i ++ ) { l [ i ] = 2 * l [ i - 1 ] + 3 ; p [ i ] = 2 * p [ i - 1 ] + 1 ; } System . out . println ( get ( n , x , l , p ) ) ; }
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