Problem:
Score : 200 points

Problem Statement

An integer N is a multiple of 9 if and only if the sum of the digits in the decimal representation of N is a multiple of 9.

Determine whether N is a multiple of 9.

Constraints

0 \leq N < 10^{200000}

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If N is a multiple of 9, print Yes; otherwise, print No.

Sample Input 1

123456789

Sample Output 1

Yes

The sum of these digits is 1+2+3+4+5+6+7+8+9=45, which is a multiple of 9, so 123456789 is a multiple of 9.

Sample Input 2

0

Sample Output 2

Yes

Sample Input 3

31415926535897932384626433832795028841971693993751058209749445923078164062862089986280

Sample Output 3

No

Solution in C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Linq;
using System.Collections.Generic;

namespace AtCoder0822
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string N = Console.ReadLine();
            //long[] NXT = Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray();
            int[] nc = new int[N.Length];
            int ans = 0;

            for (var i=0; i<N.Length; i++)
            {
                nc[i] = (int)(N[i]);

                ans += nc[i];
            }

         if(ans % 9 == 0) { Console.WriteLine("Yes"); }
            else { Console.WriteLine("No"); }
        }
    }
}