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 (GCC 9.2.1) (judge verdict: Accepted)

#include <stdio.h>
#include <string.h>

int main(){
  char N[200001];
  scanf("%s", N); // scanf("%d", &N);
  int S = 0;
  
  int k = 0; 
  
  int L = strlen(N); //N の中に入っっている文字の個数
  
  while(k < L){
    S = S + N[k] - '0';
  	k++; //k = + 1; と同じ
  }
  
  if(S % 9 == 0) printf("Yes\n");
  else printf("No\n");
  
  return 0;
}