public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  int k = input . nextInt ( ) ;
  int [ ] [ ] a = new int [ n ] [ 2 ] ;
  int i , i2 ;
  int covered = 0 ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    for ( i2 = 0 ;
    i2 < 2 ;
    i2 ++ ) {
      a [ i ] [ i2 ] = input . nextInt ( ) ;
    }
    covered = covered + ( ( a [ i ] [ 1 ] - a [ i ] [ 0 ] ) + 1 ) ;
  }
  covered = covered % k ;
  if ( covered != 0 ) {
    covered = k - covered ;
  }
  System . out . println ( covered ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; int k = input . nextInt ( ) ; int [ ] [ ] a = new int [ n ] [ 2 ] ; int i , i2 ; int covered = 0 ; for ( i = 0 ; i < n ; i ++ ) { for ( i2 = 0 ; i2 < 2 ; i2 ++ ) { a [ i ] [ i2 ] = input . nextInt ( ) ; } covered = covered + ( ( a [ i ] [ 1 ] - a [ i ] [ 0 ] ) + 1 ) ; } covered = covered % k ; if ( covered != 0 ) { covered = k - covered ; } System . out . println ( covered ) ; }
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