import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String N;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String N;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

} Main //フィールド
    Scanner sc; sc String N; N public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) Main m = new Main(sc); m new Main(sc) m.show(m.solve()) m.show m m.solve() m.solve m sc.close() sc.close sc String[] args args //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    } Main {
        this.sc = sc;
        this.N = sc.next();
    } this.sc = sc this.sc this this.sc sc this.N = sc.next() this.N this this.N sc.next() sc.next sc Scanner sc sc //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    } solve {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    } String answer = "No"; answer "No" long m = 0; m 0 if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        } !N.equals("0") N.equals("0") N.equals N "0" {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        } for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	} int i=0; int i=0; i 0 i<N.length() i N.length() N.length N i++ i++ i {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	} {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	} int tmp = N.charAt(i); tmp N.charAt(i) N.charAt N i m += tmp-48 m tmp-48 tmp 48 if (m%9 == 0) {
        	answer = "Yes";
        } m%9 == 0 m%9 m 9 0 {
        	answer = "Yes";
        } answer = "Yes" answer "Yes" return answer; answer //出力
    public void show(String answer) {
        System.out.println(answer);
    } show {
        System.out.println(answer);
    } System.out.println(answer) System.out.println System.out System System.out answer String answer answer public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String N;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

} public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String N;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    String N;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.N = sc.next();
    }
    
    //解答処理
    private String solve() {
        String answer = "No";
        long m = 0;
        if (!N.equals("0")) {
        	for (int i=0; i<N.length(); i++) {
        		int tmp = N.charAt(i);
        		m += tmp-48;
        	}
        }
        
        if (m%9 == 0) {
        	answer = "Yes";
        }
        
        return answer;
    }
    
    //出力
    public void show(String answer) {
        System.out.println(answer);
    }

}
