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 Pascal (FPC 2.6.2) (judge verdict: Accepted)

program ABC083B;
var 
    n,a,b,r,i,j,s: integer;
begin
    read(n);
    read(a);
    read(b);
    r:=0;
    for i:=1 to n do begin
        s:=0;
        j:=i;
        while j>0 do begin
            s:=s+(j mod 10);
            j:=j div 10;
        end;
        if (a<=s) and (s<=b) then begin
            r:=r+i;
        end;
    end;
    writeln(r);
end.