public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int C = sc . nextInt ( ) ;
  int [ ] [ ] ar = new int [ C ] [ 100001 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int s = sc . nextInt ( ) - 1 ;
    int t = sc . nextInt ( ) - 1 ;
    int c = sc . nextInt ( ) - 1 ;
    for ( int j = s ;
    j <= t ;
    j ++ ) {
      ar [ c ] [ j ] = 1 ;
    }
  }
  int ans = 0 ;
  for ( int i = 1 ;
  i < 100001 ;
  i ++ ) {
    int max = 0 ;
    for ( int j = 0 ;
    j < C ;
    j ++ ) {
      max += ar [ j ] [ i ] ;
    }
    ans = Math . max ( ans , max ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int C = sc . nextInt ( ) ; int [ ] [ ] ar = new int [ C ] [ 100001 ] ; for ( int i = 0 ; i < n ; i ++ ) { int s = sc . nextInt ( ) - 1 ; int t = sc . nextInt ( ) - 1 ; int c = sc . nextInt ( ) - 1 ; for ( int j = s ; j <= t ; j ++ ) { ar [ c ] [ j ] = 1 ; } } int ans = 0 ; for ( int i = 1 ; i < 100001 ; i ++ ) { int max = 0 ; for ( int j = 0 ; j < C ; j ++ ) { max += ar [ j ] [ i ] ; } ans = Math . max ( ans , max ) ; } System . out . println ( ans ) ; }
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