#include <bits/stdc++.h>
using namespace std;
int x;

int main() {
	cin >> x;
	cout << 2 << "\n";
	if (x % 2 == 0) {
		cout << x / 2 - 1 << " " << x / 2 + 1;
	} else {
		cout << x / 2 << " " <<x- x / 2 ;
	}
	return 0;
}