public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int squSize = scanner . nextInt ( ) ;
  int [ ] numbers = new int [ squSize ] ;
  int ones = 0 ;
  for ( int i = 0 ;
  i < squSize ;
  i ++ ) {
    numbers [ i ] = scanner . nextInt ( ) ;
    if ( numbers [ i ] == 1 ) {
      ones ++ ;
    }
  }
  int counter = 0 ;
  for ( int i = 0 ;
  i < squSize - 1 ;
  i ++ ) {
    if ( numbers [ i ] == 1 ) {
      ones -- ;
      if ( ones > 0 ) {
        counter += 2 ;
        if ( numbers [ i + 1 ] == 1 ) {
          counter -- ;
        }
      }
      else {
        counter ++ ;
      }
    }
  }
  if ( numbers [ squSize - 1 ] == 1 ) {
    counter ++ ;
  }
  System . out . println ( counter ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int squSize = scanner . nextInt ( ) ; int [ ] numbers = new int [ squSize ] ; int ones = 0 ; for ( int i = 0 ; i < squSize ; i ++ ) { numbers [ i ] = scanner . nextInt ( ) ; if ( numbers [ i ] == 1 ) { ones ++ ; } } int counter = 0 ; for ( int i = 0 ; i < squSize - 1 ; i ++ ) { if ( numbers [ i ] == 1 ) { ones -- ; if ( ones > 0 ) { counter += 2 ; if ( numbers [ i + 1 ] == 1 ) { counter -- ; } } else { counter ++ ; } } } if ( numbers [ squSize - 1 ] == 1 ) { counter ++ ; } System . out . println ( counter ) ; }
(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)))) (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: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (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: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier)))))) alternative: (block (expression_statement (update_expression (identifier))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))