import java.io.*;

class Ideone {
	public static void main (String[] args) {
		int n = 1337;
		System.out.println(n);
		for(int i = 1; i <= n; i++) {
			if(i != 1)
				System.out.print(" ");
			System.out.print(i);
		}
		System.out.println("");
	}
}