Problem:
Score : 200 points

Problem Statement

Let S(n) denote the sum of the digits in the decimal notation of n.
For example, S(101) = 1 + 0 + 1 = 2.

Given an integer N, determine if S(N) divides N.

Constraints

1 \leq N \leq 10^9

Input

Input is given from Standard Input in the following format:

N

Output

If S(N) divides N, print Yes; if it does not, print No.

Sample Input 1

12

Sample Output 1

Yes

In this input, N=12.
As S(12) = 1 + 2 = 3, S(N) divides N.

Sample Input 2

101

Sample Output 2

No

As S(101) = 1 + 0 + 1 = 2, S(N) does not divide N.

Sample Input 3

999999999

Sample Output 3

Yes

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using Atcoder.AtCoderBeginnerContest101.Questions;
using Atcoder.AtCoderBeginnerContest101.Extensions;

namespace Atcoder.AtCoderBeginnerContest101
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionB();    // 問題に合わせて書き換え
            var answer = question.Solve(Console.In);
            Console.WriteLine(answer);
        }
    }
}

namespace Atcoder.AtCoderBeginnerContest101.Questions
{
    // ここにQuestionクラスをコピペ
    public class QuestionB : AtCoderQuestionBase
    {
        public override string Solve(TextReader inputStream)
        {
            var n = inputStream.ReadLong();

            if (n % S(n) == 0)
            {
                return "Yes";
            }
            else
            {
                return "No";
            }
        }

        long S(long n)
        {
            long sum = 0;
            while (n != 0)
            {
                sum += n % 10;
                n /= 10;
            }

            return sum;
        }
    }


    #region Base Classes

    public interface IAtCoderQuestion
    {
        string Solve(string input);
        string Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public string Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract string Solve(TextReader inputStream);
    }

    #endregion
}

#region Extensions

namespace Atcoder.AtCoderBeginnerContest101.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion