#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
vector <int> q[11];
int ask(int l, int r) {
	cout << l << ' ' << r << '\n';
	cout << flush;
	int ret;
	cin >> ret;
	return ret;
}
int cnt, cur, n;
bool dfs(int dep) {
	if (dep == q[cnt].size()) return false;
	int temp = ask(cnt, q[cnt][dep]);
	bool flg = false;
	if (temp == n) {
		cur = n;
		return true;
	}
	if (temp < cur) {
		flg = true;
		temp = ask(cnt, q[cnt][dep]);
		cur = temp;
	}
	if (temp > cur) {
		cur = temp;
		flg = true;
	}
	if (dfs(dep + 1)) {
		if (cur == n) return true;
		return true;
	}
	if (!flg) {
		temp = ask(cnt, q[cnt][dep]);
		if (temp == n) {
			cur = n;
			return true;
		}
		if (dfs(dep + 1)) {
			if (cur == n) return true;
			return true;
		}	
	}
	return flg;
}
int main() {
	cin >> n;
	
	for (int i = 1; i <= n; i ++) {
		for (int j = n; j >= i; j --) {
			q[i].push_back(j);
		}
	}
	cin >> cur;
	
	cnt = 1;
	while (cur != n && cnt != n + 1) {
		dfs(0);
		cnt ++;
	}
	//assert(cur == n);
    return 0;
}