public static void main ( String [ ] args ) {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  Scanner sc = new Scanner ( System . in ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int c = sc . nextInt ( ) ;
  int x3 = Math . abs ( a - b ) ;
  int x1 = Math . abs ( a - c ) ;
  int x2 = Math . abs ( b - c ) ;
  int total = x1 + x2 + x3 ;
  total = Math . abs ( total - ( Math . max ( x3 , Math . max ( x2 , x1 ) ) ) ) ;
  System . out . println ( total ) ;
}

public static void main ( String [ ] args ) { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; Scanner sc = new Scanner ( System . in ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; int x3 = Math . abs ( a - b ) ; int x1 = Math . abs ( a - c ) ; int x2 = Math . abs ( b - c ) ; int total = x1 + x2 + x3 ; total = Math . abs ( total - ( Math . max ( x3 , Math . max ( x2 , x1 ) ) ) ) ; System . out . println ( total ) ; }
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