Problem: Dima loves representing an odd number as the sum of multiple primes, and Lisa loves it when there are at most three primes. Help them to represent the given number as the sum of at most than three primes.

More formally, you are given an odd numer n. Find a set of numbers pi (1 ≤ i ≤ k), such that

  1. 1 ≤ k ≤ 3
  2. pi is a prime
  3. <image>



The numbers pi do not necessarily have to be distinct. It is guaranteed that at least one possible solution exists.

Input

The single line contains an odd number n (3 ≤ n < 109).

Output

In the first line print k (1 ≤ k ≤ 3), showing how many numbers are in the representation you found.

In the second line print numbers pi in any order. If there are multiple possible solutions, you can print any of them.

Examples

Input

27


Output

3
5 11 11

Note

A prime is an integer strictly larger than one that is divisible only by one and by itself.

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.*;

public class d1 {
	BufferedReader br;
	StringTokenizer in;
	PrintWriter out;

	public String nextToken() throws IOException {
		while (in == null || !in.hasMoreTokens()) {
			in = new StringTokenizer(br.readLine());
		}
		return in.nextToken();
	}

	public int nextInt() throws IOException {
		return Integer.parseInt(nextToken());
	}

	public double nextDouble() throws IOException {
		return Double.parseDouble(nextToken());
	}

	public long nextLong() throws IOException {
		return Long.parseLong(nextToken());
	}

	public static void main(String[] args) throws IOException {
		new d1().run();
	}

	static boolean is_prime(int n) {
		boolean flag = false;

		for (int i = 2; i <= Math.sqrt(n); i++) {
			if (n % i == 0) {
				flag = true;
				break;
			}
		}

		return !flag;
	}

	static TreeSet<Integer> p;

	
	public void solve() throws IOException {

		int n = nextInt();
		
		TreeSet<Integer> q = new TreeSet();
		p = new TreeSet();

		
		if (is_prime(n)){
			out.println(1);
			out.print(n);
		}
		else{
			if (is_prime(n - 2)){
				out.println(2);
				out.print("2 " + (n - 2));
			}
			else{
				q.add(1);

				for (int i = 2; i < 100000; i++) {
					if (!q.contains(i)) {
						p.add(i);

						for (int j = 2; j <= 100000 / i; j++) {
							q.add(j * i);
						}
					}
				}
				
				for (int i : p) {
					for (int j : p) {
						if (i + j < n){
							if (is_prime(n - i - j)){
								out.println(3);
								out.print(i + " " + j + " " + (n - i - j));
								out.close();
								System.exit(0);
							}
						}
					}
				}
			}
				
		}
	}

	public void run() {
		try {
			br = new BufferedReader(new InputStreamReader(System.in));
			out = new PrintWriter(System.out);
			solve();
			out.close();
		} catch (IOException e) {
			e.printStackTrace();
			System.exit(1);
		}
	}
}