#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")


int N;

int ask(int i, int j) {
  printf("%d %d\n", i + 1, j + 1);
  fflush(stdout);
  int ret;
  scanf("%d", &ret);
  if (ret == -1) {
    exit(0);
  }
  return ret;
}

vector<int> where;

bool cmp(int u, int v) {
  if (u == v) return false;
  if (where[u] > where[v]) return !cmp(v, u);
  const int res = ask(where[u], where[v]);
  if (res) {
    swap(where[u], where[v]);
  }
  return !res;
}

vector<int> us;

template <class Iter, class Comp>
void mergeSort(Iter first, Iter last, Iter buffer, Comp comp) {
  if (last - first >= 2) {
    if (first == us.begin() && last == us.begin() + N/2) {
      // check sorted?
      bool ok = true;
      for (int i = 0; i < N/2 - 1; ++i) {
        ok = ok && cmp(us[i], us[i + 1]);
      }
cerr<<"skip [0, N/2): "<<ok<<endl;
      if (ok) {
        return;
      }
    }
    Iter middle = first + (last - first) / 2;
    mergeSort(first, middle, buffer, comp);
    mergeSort(middle, last, buffer, comp);
    Iter i = first, j = first, k = buffer, l = buffer;
    for (; j != middle; ) *l++ = std::move(*j++);
    for (; k != l && j != last; ) *i++ = comp(*j, *k) ? *j++ : *k++;
    for (; k != l; ) *i++ = std::move(*k++);
  }
}
template <class T, class Comp> void mergeSort(T *first, T *last, Comp comp) {
  vector<T> buffer((last - first) / 2);
  mergeSort(first, last, buffer.data(), comp);
}
template <class T, class Comp> void mergeSort(vector<T> &as, Comp comp) {
  vector<T> buffer(as.size() / 2);
  mergeSort(as.begin(), as.end(), buffer.begin(), comp);
}

int main() {
  scanf("%d", &N);
  
  where.resize(N);
  us.resize(N);
  for (int u = 0; u < N; ++u) {
    where[u] = u;
    us[u] = u;
  }
  mergeSort(us, cmp);
  for (int i = 0; i < N; ++i) {
    const int u = us[i];
    if (i != where[u]) {
      ask(i, where[u]);
    }
  }
  
  puts("-1 -1");
  fflush(stdout);
  
  return 0;
}