Problem:
Score : 200 points

Problem Statement

Find the sum of the integers between 1 and N (inclusive), whose sum of digits written in base 10 is between A and B (inclusive).

Constraints

1 \leq N \leq 10^4

1 \leq A \leq B \leq 36

All input values are integers.

Input

Input is given from Standard Input in the following format:

N A B

Output

Print the sum of the integers between 1 and N (inclusive), whose sum of digits written in base 10 is between A and B (inclusive).

Sample Input 1

20 2 5

Sample Output 1

84

Among the integers not greater than 20, the ones whose sums of digits are between 2 and 5, are: 2,3,4,5,11,12,13,14 and 20. We should print the sum of these, 84.

Sample Input 2

10 1 2

Sample Output 2

13

Sample Input 3

100 4 16

Sample Output 3

4554

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php
  	fscanf(STDIN, '%d %d %d', $end, $min, $max);

	for($i = 1; $i <= $end; $i++){
      	$num = $i;
      	$digit_sum = 0;
      	while($num > 0){
          	$digit_sum += $num % 10;
          	$num = (int) $num / 10;
        }
      	if($digit_sum >= $min && $digit_sum <= $max){
          	$result += $i;
        }
    }
	echo $result;