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: Accepted)

using System;
using System.Linq;
using System.Numerics;

namespace ABC176
{
    class Program
    {
        static void Main(string[] args)
        {
            b();
        }

        public static void b()
        {
            string n = Console.ReadLine();
            //long g = long.Parse(n);
            long sum = 0;
            for(int i = 0; i < n.Length; i++)
            {
                char c = n[i];
                int x = Convert.ToInt32(new string(c, 1));
                sum += x;
               // Console.WriteLine(sum);
            }
            //Console.WriteLine(sum);
            if(sum % 9 == 0)
            { Console.WriteLine("Yes"); }
            else
            { Console.WriteLine("No"); }
        }
    }
}