#include <bits/stdc++.h>

using namespace std;

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

void usain_bolt()
{
    ios::sync_with_stdio(false);
    fin.tie(0);
}

int main()
{
    usain_bolt();

    int n;

    fin >> n;

    fout << n - 1 << " 1" << "\n";
    fout << "1\n";
    for(int i = 1; i < n; ++i) fout << i << "\n";
    return 0;
}