public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int M = sc . nextInt ( ) ;
  ArrayList < Integer > [ ] list = new ArrayList [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    list [ i ] = new ArrayList < Integer > ( ) ;
  }
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    int S = sc . nextInt ( ) ;
    for ( int j = 0 ;
    j < S ;
    j ++ ) {
      list [ i ] . add ( sc . nextInt ( ) ) ;
    }
  }
  int counter = 0 ;
  for ( int i = 0 ;
  i <= M ;
  i ++ ) {
    boolean flag = true ;
    for ( int j = 0 ;
    j < N ;
    j ++ ) {
      if ( list [ j ] . contains ( i ) ) {
      }
      else {
        flag = false ;
      }
    }
    if ( flag ) {
      counter ++ ;
    }
  }
  System . out . println ( counter ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int M = sc . nextInt ( ) ; ArrayList < Integer > [ ] list = new ArrayList [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { list [ i ] = new ArrayList < Integer > ( ) ; } for ( int i = 0 ; i < N ; i ++ ) { int S = sc . nextInt ( ) ; for ( int j = 0 ; j < S ; j ++ ) { list [ i ] . add ( sc . nextInt ( ) ) ; } } int counter = 0 ; for ( int i = 0 ; i <= M ; i ++ ) { boolean flag = true ; for ( int j = 0 ; j < N ; j ++ ) { if ( list [ j ] . contains ( i ) ) { } else { flag = false ; } } if ( flag ) { counter ++ ; } } System . out . println ( counter ) ; }
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