public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int [ ] arr = new int [ 4 ] ;
  for ( int i = 0 ;
  i < 4 ;
  i ++ ) {
    arr [ i ] = in . nextInt ( ) ;
  }
  int c = 0 ;
  int newArr [ ] = new int [ 3 ] ;
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) {
    newArr [ i ] = arr [ i ] ;
  }
  Arrays . sort ( newArr ) ;
  int ab = Math . abs ( newArr [ 0 ] - newArr [ 1 ] ) - arr [ 3 ] ;
  int bc = Math . abs ( newArr [ 1 ] - newArr [ 2 ] ) - arr [ 3 ] ;
  int ac = Math . abs ( newArr [ 0 ] - newArr [ 2 ] ) - arr [ 3 ] ;
  while ( ab < 0 ) {
    ab ++ ;
    c ++ ;
  }
  while ( bc < 0 ) {
    bc ++ ;
    c ++ ;
  }
  System . out . println ( c ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int [ ] arr = new int [ 4 ] ; for ( int i = 0 ; i < 4 ; i ++ ) { arr [ i ] = in . nextInt ( ) ; } int c = 0 ; int newArr [ ] = new int [ 3 ] ; for ( int i = 0 ; i < 3 ; i ++ ) { newArr [ i ] = arr [ i ] ; } Arrays . sort ( newArr ) ; int ab = Math . abs ( newArr [ 0 ] - newArr [ 1 ] ) - arr [ 3 ] ; int bc = Math . abs ( newArr [ 1 ] - newArr [ 2 ] ) - arr [ 3 ] ; int ac = Math . abs ( newArr [ 0 ] - newArr [ 2 ] ) - arr [ 3 ] ; while ( ab < 0 ) { ab ++ ; c ++ ; } while ( bc < 0 ) { bc ++ ; c ++ ; } System . out . println ( c ) ; }
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