public static int arraySum ( int arr [ ] , int n ) {
  int x = ( n + 1 ) / 2 ;
  return ( arr [ 0 ] - 1 ) * n + x * x ;
}

public static int arraySum ( int arr [ ] , int n ) { int x = ( n + 1 ) / 2 ; return ( arr [ 0 ] - 1 ) * n + x * x ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) (return_statement (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier))))))