*******************************
*** The hack uses generator ***
*******************************

** Command line arguments **
no arguments

** Generated test **


** Generator source **
#include <bits/stdc++.h>
using namespace std;

int main() 
{
	freopen("output.txt", "w", stdout);
	cout << 200000 << endl;
	for (int i = 200000; i >= 1; i--)
	{
		cout << i << ' ';
	}
	return 0;
}

// ������ 224.
// ������ 354.

/*
	int n;
	cin >> n;
	vector <char> s(n);
	for (char &i : s) cin >> i;
	for (int i = 0; i < s.size() - 1; i++)
	{
		if (s[i] == s[i + 1])
		{
			s[i] == '-';
			n--;
		}
	}
	if (n % 2 == 1)
	{
		n--;
		s[0] = '-';
	}
	cout << s.size() - n;
*/