import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String ns = sc.next();
    String[] s = ns.split("");
    int sum = 0;
    for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    }
    if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} import java.util.*; util.* java class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String ns = sc.next();
    String[] s = ns.split("");
    int sum = 0;
    for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    }
    if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String ns = sc.next();
    String[] s = ns.split("");
    int sum = 0;
    for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    }
    if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String ns = sc.next();
    String[] s = ns.split("");
    int sum = 0;
    for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    }
    if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String ns = sc.next(); ns sc.next() sc.next sc String[] s = ns.split(""); s ns.split("") ns.split ns "" int sum = 0; sum 0 for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    } int i = 0; int i = 0; i 0 i < s.length i s.length s s.length i++ i++ i {
      sum = sum + Integer.parseInt(s[i]);
    } {
      sum = sum + Integer.parseInt(s[i]);
    } sum = sum + Integer.parseInt(s[i]) sum sum + Integer.parseInt(s[i]) sum Integer.parseInt(s[i]) Integer.parseInt Integer s[i] s i if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    } sum % 9 == 0 sum % 9 sum 9 0 {
      System.out.println("Yes");
    } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
      System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String ns = sc.next();
    String[] s = ns.split("");
    int sum = 0;
    for (int i = 0; i < s.length; i++) {
      sum = sum + Integer.parseInt(s[i]);
    }
    if (sum % 9 == 0) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}