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.



const readline = require('readline');
 const inp = readline.createInterface({
  input: process.stdin
 });
 const userInput = [];
 inp.on("line", (data) => {
 userInput.push(data);
 });
 inp.on("close", () => {
 var data = userInput[0].split(" ");
 var a = (data[0]);
 var b = a.split('');
 var sum=0;
 for(i=0;i<b.length;i++)
 {sum=sum+ +b[i]}
 if(sum%3==0)
 console.log("yes")
 else
 console.log("not")

 });