public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  N = sc . nextInt ( ) ;
  flowers = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    flowers [ i ] = sc . nextInt ( ) ;
  }
  sc . close ( ) ;
  int ans = 0 ;
  int cur = 0 ;
  for ( int k = 0 ;
  k < N ;
  k ++ ) {
    if ( flowers [ k ] > cur ) {
      ans += flowers [ k ] - cur ;
    }
    cur = flowers [ k ] ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; N = sc . nextInt ( ) ; flowers = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { flowers [ i ] = sc . nextInt ( ) ; } sc . close ( ) ; int ans = 0 ; int cur = 0 ; for ( int k = 0 ; k < N ; k ++ ) { if ( flowers [ k ] > cur ) { ans += flowers [ k ] - cur ; } cur = flowers [ k ] ; } System . out . println ( ans ) ; }
(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)))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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: (block (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))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (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: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))