public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String nx = scanner . nextLine ( ) ;
  String price = scanner . nextLine ( ) ;
  scanner . close ( ) ;
  int n = Integer . parseInt ( nx . split ( " " ) [ 0 ] ) ;
  int x = Integer . parseInt ( nx . split ( " " ) [ 1 ] ) ;
  String [ ] prices = price . split ( " " ) ;
  String bitX = Integer . toBinaryString ( x ) ;
  int toAddZero = n - bitX . length ( ) ;
  for ( int i = 0 ;
  i < toAddZero ;
  i ++ ) {
    bitX = "0" + bitX ;
  }
  boolean [ ] shouldAdd = new boolean [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String bit = bitX . substring ( bitX . length ( ) - 1 - i , bitX . length ( ) - i ) ;
    shouldAdd [ i ] = bit . equals ( "1" ) ;
  }
  int sumPrice = 0 ;
  for ( int i = 0 ;
  i < shouldAdd . length ;
  i ++ ) {
    if ( shouldAdd [ i ] ) {
      sumPrice += Integer . parseInt ( prices [ i ] ) ;
    }
  }
  System . out . println ( sumPrice ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String nx = scanner . nextLine ( ) ; String price = scanner . nextLine ( ) ; scanner . close ( ) ; int n = Integer . parseInt ( nx . split ( " ▁ " ) [ 0 ] ) ; int x = Integer . parseInt ( nx . split ( " ▁ " ) [ 1 ] ) ; String [ ] prices = price . split ( " ▁ " ) ; String bitX = Integer . toBinaryString ( x ) ; int toAddZero = n - bitX . length ( ) ; for ( int i = 0 ; i < toAddZero ; i ++ ) { bitX = "0" + bitX ; } boolean [ ] shouldAdd = new boolean [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { String bit = bitX . substring ( bitX . length ( ) - 1 - i , bitX . length ( ) - i ) ; shouldAdd [ i ] = bit . equals ( "1" ) ; } int sumPrice = 0 ; for ( int i = 0 ; i < shouldAdd . length ; i ++ ) { if ( shouldAdd [ i ] ) { sumPrice += Integer . parseInt ( prices [ i ] ) ; } } System . out . println ( sumPrice ) ; }
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