public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int n = in . nextInt ( ) , d = in . nextInt ( ) , i , a [ ] = new int [ n ] , c = 0 , l = - 1 ;
  for ( i = 0 ;
  i < n ;
  i ++ ) a [ i ] = in . nextInt ( ) ;
  in . close ( ) ;
  for ( i = 0 ;
  i < n ;
  i ++ ) {
    if ( i == 0 || ( i > 0 && a [ i ] - d >= a [ i - 1 ] + d && a [ i ] - d != l ) ) {
      c ++ ;
      l = a [ i ] - d ;
    }
    if ( i == n - 1 || ( i < n - 1 && a [ i ] + d <= a [ i + 1 ] - d && a [ i ] + d != l ) ) {
      c ++ ;
      l = a [ i ] + d ;
    }
  }
  System . out . println ( c ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int n = in . nextInt ( ) , d = in . nextInt ( ) , i , a [ ] = new int [ n ] , c = 0 , l = - 1 ; for ( i = 0 ; i < n ; i ++ ) a [ i ] = in . nextInt ( ) ; in . close ( ) ; for ( i = 0 ; i < n ; i ++ ) { if ( i == 0 || ( i > 0 && a [ i ] - d >= a [ i - 1 ] + d && a [ i ] - d != l ) ) { c ++ ; l = a [ i ] - d ; } if ( i == n - 1 || ( i < n - 1 && a [ i ] + d <= a [ i + 1 ] - d && a [ i ] + d != l ) ) { c ++ ; l = a [ i ] + d ; } } 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: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier)))) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (decimal_integer_literal)))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) 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))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (identifier)))) right: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) right: (identifier)))))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (identifier)))) right: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) right: (identifier)))))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))