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 PHP (5.6.30) (judge verdict: Accepted)

<?php

list($n , $a, $b) = explode(" ", fgets(STDIN));

function calc($n){
    $r = 0;
    while($n>0){
        $r += $n%10;
        $n /= 10;    
    }
    return $r;
}

$ttl = 0;
for($i=1; $i<=$n; ++$i){
    $r = calc($i);
    if($r>=$a && $r<=$b){
        $ttl += $i;
    }
}
echo $ttl;
?>