public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int [ ] a = new int [ 3 ] ;
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) a [ i ] = Integer . parseInt ( sc . next ( ) ) ;
  int c = 0 ;
  while ( true ) {
    Arrays . sort ( a ) ;
    if ( a [ 0 ] == a [ 1 ] && a [ 1 ] == a [ 2 ] ) break ;
    else if ( a [ 1 ] == a [ 2 ] ) a [ 0 ] += 2 ;
    else {
      a [ 0 ] ++ ;
      a [ 1 ] ++ ;
    }
    c ++ ;
  }
  System . out . println ( c ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int [ ] a = new int [ 3 ] ; for ( int i = 0 ; i < 3 ; i ++ ) a [ i ] = Integer . parseInt ( sc . next ( ) ) ; int c = 0 ; while ( true ) { Arrays . sort ( a ) ; if ( a [ 0 ] == a [ 1 ] && a [ 1 ] == a [ 2 ] ) break ; else if ( a [ 1 ] == a [ 2 ] ) a [ 0 ] += 2 ; else { a [ 0 ] ++ ; a [ 1 ] ++ ; } c ++ ; } System . out . println ( c ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (true)) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (array_access array: (identifier) index: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (array_access array: (identifier) index: (decimal_integer_literal))))) consequence: (break_statement) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (array_access array: (identifier) index: (decimal_integer_literal)))) consequence: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) alternative: (block (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal))))))) (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))