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
	a,b,n,i,s:longint;
function fac(x:longint):longint;
var
	sum:longint;
begin
	sum:=0;
	while x<>0 do
	begin
		sum:=sum+x mod 10;
		x:=x div 10;
	end;
	exit(sum);
end;
begin
	read(n,a,b);
	s:=0;
	for i:=1 to n do
		if (fac(i)>=a) and (fac(i)<=b) then s:=s+i;
	writeln(s);
end.