

import java.util.*;
import java.io.*;

public class Main {
	static FastReader in = new FastReader();

	public static void main(String[] args) {
		solve();
	}

	static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	}
}


 import java.util.*; util.* java import java.io.*; io.* java public class Main {
	static FastReader in = new FastReader();

	public static void main(String[] args) {
		solve();
	}

	static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	}
} Main static FastReader in = new FastReader(); in new FastReader() public static void main(String[] args) {
		solve();
	} main {
		solve();
	} solve() solve String[] args args static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	} solve {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	} String[] n = in.nextLine().split(""); n in.nextLine().split("") in.nextLine().split in.nextLine() in.nextLine in "" long x = 0l; x 0l for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		} int i = 0; int i = 0; i 0 i < n.length i n.length n n.length i++ i++ i {
			x += Integer.valueOf(n[i]);

		} {
			x += Integer.valueOf(n[i]);

		} x += Integer.valueOf(n[i]) x Integer.valueOf(n[i]) Integer.valueOf Integer n[i] n i System.out.println(x % 9 == 0 ? "Yes" : "No") System.out.println System.out System System.out x % 9 == 0 ? "Yes" : "No" x % 9 == 0 x % 9 x 9 0 "Yes" "No" static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	} FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		} FastReader {
			br = new BufferedReader(new InputStreamReader(System.in));
		} br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} next {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		} while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			} st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			} try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				} IOException e {
					e.printStackTrace();
				} e.printStackTrace() e.printStackTrace e {
					st = new StringTokenizer(br.readLine());
				} st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
			return Long.parseLong(next());
		} nextLong {
			return Long.parseLong(next());
		} return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
			return Double.parseDouble(next());
		} nextDouble {
			return Double.parseDouble(next());
		} return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		} nextLine {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		} String str = ""; str "" try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} IOException e {
				e.printStackTrace();
			} e.printStackTrace() e.printStackTrace e {
				str = br.readLine();
			} str = br.readLine() str br.readLine() br.readLine br return str; str int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		} readarr {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		} int[] a = new int[abc]; a new int[abc] abc for (int i = 0; i < abc; i++)
				a[i] = nextInt(); int i = 0; int i = 0; i 0 i < abc i abc i++ i++ i a[i] = nextInt(); a[i] = nextInt() a[i] a i nextInt() nextInt return a; a int abc abc public class Main {
	static FastReader in = new FastReader();

	public static void main(String[] args) {
		solve();
	}

	static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	}
} public class Main {
	static FastReader in = new FastReader();

	public static void main(String[] args) {
		solve();
	}

	static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	}
} Main


import java.util.*;
import java.io.*;

public class Main {
	static FastReader in = new FastReader();

	public static void main(String[] args) {
		solve();
	}

	static void solve() {
		String[] n = in.nextLine().split("");
		long x = 0l;
		for(int i = 0; i < n.length; i++)
		{
			x += Integer.valueOf(n[i]);

		}
		System.out.println(x % 9 == 0 ? "Yes" : "No");
	}

	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		int[] readarr(int abc) {
			int[] a = new int[abc];
			for (int i = 0; i < abc; i++)
				a[i] = nextInt();
			return a;
		}
	}
}



