#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("lacate.in");
ofstream fout("lacate.out");

int n;
void read(){
	fin >> n;
}

void solve(){
	fout << n-1 << " 1\n";
	fout << "1\n1\n";
	for(int i = 2; i < n; ++i){
		fout << i << "\n";
	}
}

int main(){
	// ios_base::sync_with_stdio(false);
	read();
	solve();
	return 0;
}