#include <fstream>
using namespace std;

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

int N;

int main() {
    fin >> N;

    if (N == 2) {
        fout << "1 1\n1\n1\n";
        return 0;
    }

    fout << N << " " << 2 << "\n";

    for (int i = 1; i <= N; ++i)
        fout << i << " " << i % N + 1 << "\n";

    return 0;
}