public static void main ( String [ ] args ) {
  int n = sc . nextInt ( ) ;
  int a = sc . nextInt ( ) ;
  int [ ] d = new int [ 51 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) d [ i ] = sc . nextInt ( ) ;
  long [ ] [ ] [ ] dp = new long [ 60 ] [ 60 ] [ 2510 ] ;
  dp [ 0 ] [ 0 ] [ 0 ] = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int x = d [ i ] ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      for ( int k = 0 ;
      k < 2500 ;
      k ++ ) {
        if ( dp [ i ] [ j ] [ k ] > 0 ) {
          dp [ i + 1 ] [ j ] [ k ] += dp [ i ] [ j ] [ k ] ;
          dp [ i + 1 ] [ j + 1 ] [ k + x ] += dp [ i ] [ j ] [ k ] ;
        }
      }
    }
  }
  long ret = 0 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    for ( int j = 1 ;
    j <= 2500 ;
    j ++ ) {
      if ( i * a == j && dp [ n ] [ i ] [ j ] > 0 ) {
        ret += dp [ n ] [ i ] [ j ] ;
      }
    }
  }
  System . out . println ( ret ) ;
}

public static void main ( String [ ] args ) { int n = sc . nextInt ( ) ; int a = sc . nextInt ( ) ; int [ ] d = new int [ 51 ] ; for ( int i = 0 ; i < n ; i ++ ) d [ i ] = sc . nextInt ( ) ; long [ ] [ ] [ ] dp = new long [ 60 ] [ 60 ] [ 2510 ] ; dp [ 0 ] [ 0 ] [ 0 ] = 1 ; for ( int i = 0 ; i < n ; i ++ ) { int x = d [ i ] ; for ( int j = 0 ; j < n ; j ++ ) { for ( int k = 0 ; k < 2500 ; k ++ ) { if ( dp [ i ] [ j ] [ k ] > 0 ) { dp [ i + 1 ] [ j ] [ k ] += dp [ i ] [ j ] [ k ] ; dp [ i + 1 ] [ j + 1 ] [ k + x ] += dp [ i ] [ j ] [ k ] ; } } } } long ret = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { for ( int j = 1 ; j <= 2500 ; j ++ ) { if ( i * a == j && dp [ n ] [ i ] [ j ] > 0 ) { ret += dp [ n ] [ i ] [ j ] ; } } } System . out . println ( ret ) ; }
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