import java.util.Scanner;
import java.util.*;

public class prog {
  Scanner sc = new java.util.Scanner(System.in);
  
  private void solve() {
    int n = sc.nextInt();
    System.out.println(20);
    for (int i = 0; i < 20; i++) System.out.print((1 << i) + " ");
    System.out.println();
  }
  
  
  public static void main(final String[] args) {
    new prog().solve();
  }
}