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.Collections.Generic;
class Program
{

    static void Main()
    {
        string N = Console.ReadLine();
        long p = 0;

        for(int i=0;i<N.Length;i++)
        {
            char c = N[i];
            if(c==1)
            {
                p += 1;
            }
            else if(c==2)
            {
                p += 2;
            }
            else if (c == 3)
            {
                p += 3;
            }
            else if (c == 4)
            {
                p += 4;
            }
            else if (c == 5)
            {
                p += 5;
            }
            else if (c == 6)
            {
                p += 6;
            }
            else if (c == 7)
            {
                p += 7;
            }
            else if (c == 8)
            {
                p += 8;
            }
            else if (c == 9)
            {
                p += 9;
            }
        }
        if(p%9==0)
        {
            Console.WriteLine("Yes");
        }
        else
        {
            Console.WriteLine("No");
        }
    }

}