#include <fstream>

using namespace std;

int main() {
  ifstream cin("lacate.in");
  ofstream cout("lacate.out");
  int n;
  cin >> n;
  cin.close();
  if (n == 2) {
    cout << "1 1\n1\n1\n";
    cout.close();
    return 0;
  }
  cout << n << " 2\n";
  for (int i = 1; i <= n; ++i) {
    cout << i << " ";
    if (i < n)
      cout << i + 1 << "\n";
    else
      cout << "1\n";
  }
  cout.close();
  return 0;
}