public static void main ( String [ ] args ) throws Exception {
  Scanner sc = new Scanner ( System . in ) ;
  int [ ] A = {
    sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) };
    int min = Integer . MAX_VALUE ;
    for ( int i = 0 ;
    i < 3 ;
    i ++ ) {
      for ( int j = 0 ;
      j < 3 ;
      j ++ ) {
        if ( j == i ) continue ;
        for ( int k = 0 ;
        k < 3 ;
        k ++ ) {
          if ( k == i || k == j ) continue ;
          int cost = Math . abs ( A [ i ] - A [ j ] ) + Math . abs ( A [ j ] - A [ k ] ) ;
          if ( min > cost ) min = cost ;
        }
      }
    }
    System . out . println ( min ) ;
  }
  
public static void main ( String [ ] args ) throws Exception { Scanner sc = new Scanner ( System . in ) ; int [ ] A = { sc . nextInt ( ) , sc . nextInt ( ) , sc . nextInt ( ) } ; int min = Integer . MAX_VALUE ; for ( int i = 0 ; i < 3 ; i ++ ) { for ( int j = 0 ; j < 3 ; j ++ ) { if ( j == i ) continue ; for ( int k = 0 ; k < 3 ; k ++ ) { if ( k == i || k == j ) continue ; int cost = Math . abs ( A [ i ] - A [ j ] ) + Math . abs ( A [ j ] - A [ k ] ) ; if ( min > cost ) min = cost ; } } } System . out . println ( min ) ; }
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