#include <bits/stdc++.h>

int main() {
	int n;
	scanf("%d", &n);
	std::vector<int> x;
	for (int i = 0; i < n; i++) x.push_back(i);
	std::vector<std::pair<int, int> > log;
	while (x.size() > 1) {
		std::vector<int> next;
		for (int i = 0; i < x.size() / 2; i++) {
			log.push_back({x[2 * i], x[2 * i + 1]});
			printf("? %d %d\n", log.back().first + 1, log.back().second + 1);
			fflush(stdout);
			int cur;
			scanf("%d", &cur);
			next.push_back(cur - 1);
		}
		x.swap(next);
	}
	std::vector<int> y;
	for (auto &i : log) {
		if (i.first == x[0]) y.push_back(i.second);
		if (i.second == x[0]) y.push_back(i.first);
	}
	while (y.size() > 1) {
		std::vector<int> next;
		for (int i = 0; i < y.size() / 2; i++) {
			printf("? %d %d\n", y[2 * i] + 1, y[2 * i + 1] + 1);
			fflush(stdout);
			int cur;
			scanf("%d", &cur);
			next.push_back(cur - 1);
		}
		y.swap(next);
	}
	printf("! %d\n", y[0] + 1);
	
	
	return 0;
}