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 Lua (5.3.2) (judge verdict: Accepted)

local ior = io.read
local n, a, b = ior("*n", "*n", "*n")

local function getsum(x)
  local r = 0
  while(0 < x) do
    r = r + x % 10
    x = x // 10
  end
  return r
end

local ret = 0
for i = 1, n do
  local z = getsum(i)
  if(a <= z and z <= b) then ret = ret + i end
end
print(ret)