1.You are given a task to tell whether the number is pure or not. A pure number is a number whose sum of digits is multiple of 3.

You are given a task to tell whether the number is pure or not. A pure number is a number whose sum of digits is multiple of 3.

O(1) time and O(1) space

Input Description:
You are given a number n.

Output Description:
Print yes if it is pure else not

Sample Input :
13
Sample Output :
not


n=int(input())
if(n%3==0):
  print('yes')
else:
  print('not')