public static void main ( String arg [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  int i = 0 ;
  for ( int j = 0 ;
  j < n ;
  j ++ ) arr [ j ] = sc . nextInt ( ) ;
  int sum = 0 , level = arr [ 0 ] ;
  sum += arr [ 0 ] ;
  for ( ;
  i < n - 1 ;
  i ++ ) {
    if ( level == arr [ i ] ) sum ++ ;
    if ( i + 1 < n && ( arr [ i ] - arr [ i + 1 ] > 0 ) ) {
      sum = sum + arr [ i ] - arr [ i + 1 ] + 1 ;
      level = arr [ i + 1 ] ;
    }
    else if ( i + 1 < n && ( arr [ i ] - arr [ i + 1 ] < 0 ) ) {
      sum = sum + 1 + arr [ i + 1 ] - arr [ i ] ;
      level = arr [ i + 1 ] ;
    }
    else {
      sum ++ ;
    }
  }
  if ( level == arr [ i ] ) {
    sum ++ ;
  }
  else {
    sum = sum + ( arr [ i ] - level ) + 1 ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String arg [ ] ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] arr = new int [ n ] ; int i = 0 ; for ( int j = 0 ; j < n ; j ++ ) arr [ j ] = sc . nextInt ( ) ; int sum = 0 , level = arr [ 0 ] ; sum += arr [ 0 ] ; for ( ; i < n - 1 ; i ++ ) { if ( level == arr [ i ] ) sum ++ ; if ( i + 1 < n && ( arr [ i ] - arr [ i + 1 ] > 0 ) ) { sum = sum + arr [ i ] - arr [ i + 1 ] + 1 ; level = arr [ i + 1 ] ; } else if ( i + 1 < n && ( arr [ i ] - arr [ i + 1 ] < 0 ) ) { sum = sum + 1 + arr [ i + 1 ] - arr [ i ] ; level = arr [ i + 1 ] ; } else { sum ++ ; } } if ( level == arr [ i ] ) { sum ++ ; } else { sum = sum + ( arr [ i ] - level ) + 1 ; } System . out . println ( sum ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) 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)))) (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 (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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: (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))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (decimal_integer_literal)))) (for_statement condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) consequence: (expression_statement (update_expression (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (array_access array: (identifier) index: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (update_expression (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))) right: (decimal_integer_literal)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))