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: Time Limit Exceeded)

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
           // var sw = new System.Diagnostics.Stopwatch();
            //sw.Start();
            //String N = Console.ReadLine();
            //int len = N.Length;
            //long sum = 0;

            //for (int i = 0; i < len; i++)
            //{
            //    sum += long.Parse(N[i].ToString());
            //}
            //if (sum % 9 == 0)
            //{
            //    Console.WriteLine("Yes");
            //}
            //else
            //{
            //    Console.WriteLine("No");
            //}

            BigInteger N = BigInteger.Parse(Console.ReadLine());
            string S = N.ToString();
            int A = 0;
            for (int i = 0; i < S.Length; i++)
            {
                int I = int.Parse(S.Substring(i, 1));
                A += I;
            }
            if (A % 9 == 0)
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }
            //sw.Stop();

            //Console.WriteLine(sw.ElapsedMilliseconds);

        }
    }
}
//int[] N = Console.ReadLine().Split(" ").Select(x => int.Parse(x)).ToArray();