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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace AtCoder_20190218
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] str = Console.ReadLine().Split(' ');


            int N = int.Parse(str[0]);
            int A = int.Parse(str[1]);
            int B = int.Parse(str[2]);

            int Result = 0;

            for (int i = 1; i <= N; i++)
            {
                int keta1 = i % 10;
                int keta2 = (i / 10) % 10;
                int keta3 = (i / 100) % 10;
                int keta4 = (i / 1000) % 10;
                int keta5 = (i / 10000) % 10;

                int total = keta1 + keta2 + keta3 + keta4 + keta5;

                if(A<=total&&total<=B)
                {
                    Result += i;
                }
            }

            Console.WriteLine(Result);
        }
    }
}