#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> a = {1, 1};
  for (int i = 0; i < N - 1; i++){
    a.push_back((a[i] + a[i + 1] + 1) % (N + 41));
  }
  for (int i = 0; i < N; i++){
    cout << a[i] << ' ' << a[i + 1] << endl;
  }
}