import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 * @author George Marcus
 */
public class prog {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Folklore solver = new Folklore();
		solver.solve(1, in, out);
		out.close();
	}
}

class Folklore {
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        out.println(20);
        for (int i = 0; i < 20; i++) {
            out.print((1 << i) + " ");
        }
        out.println();
    }
}

class InputReader {
    private InputStream stream;

    public InputReader(InputStream stream) {
        this.stream = stream;
    }

}