static int countWays ( int n , int arr [ ] , int len ) {
  if ( n == 0 ) return 1 ;
  int no_ways = 0 ;
  for ( int i = 0 ;
  i < len ;
  i ++ ) {
    if ( n - arr [ i ] >= 0 ) {
      no_ways += countWays ( n - arr [ i ] , arr , len ) ;
    }
  }
  return no_ways ;
}

static int countWays ( int n , int arr [ ] , int len ) { if ( n == 0 ) return 1 ; int no_ways = 0 ; for ( int i = 0 ; i < len ; i ++ ) { if ( n - arr [ i ] >= 0 ) { no_ways += countWays ( n - arr [ i ] , arr , len ) ; } } return no_ways ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (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: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) (identifier) (identifier))))))))) (return_statement (identifier))))