number1题解

#include <bits/stdc++.h>
using namespace std;
char n[1000005];
int sum,ln;
int main(){
scanf("%s",n+1);
ln = strlen(n+1);
for(int i = 1;i<=ln;i++){
sum+=n[i]-'0';
}
if(sum % 9==0){
cout<<"YES";
}
else{
cout<<"NO";
}
}