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)

var
 n,a,b,i,k,s,x:longint;
begin
 readln(n,a,b);
 for i:=1 to n do
  begin
   k:=i;
   x:=0;
   while k<>0 do
    begin
     x:=x+k mod 10;
     k:=k div 10;
    end;
   if (x>=a) and (x<=b) then s:=s+i;
  end;
 write(s);
end.