public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int k = sc . nextInt ( ) ;
  int maxJoy = - 1000000000 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int f = sc . nextInt ( ) ;
    int t = sc . nextInt ( ) ;
    if ( t < k ) {
      if ( maxJoy < f ) maxJoy = f ;
    }
    else {
      if ( maxJoy < ( f - ( t - k ) ) ) maxJoy = f - ( t - k ) ;
    }
  }
  System . out . println ( maxJoy ) ;
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; int maxJoy = - 1000000000 ; for ( int i = 0 ; i < n ; i ++ ) { int f = sc . nextInt ( ) ; int t = sc . nextInt ( ) ; if ( t < k ) { if ( maxJoy < f ) maxJoy = f ; } else { if ( maxJoy < ( f - ( t - k ) ) ) maxJoy = f - ( t - k ) ; } } System . out . println ( maxJoy ) ; }
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