#include <iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	int s0, s1;
	cout << "? " << 1 << endl;
	cin >> s0;
	cout << "? " << n - 1 << endl;
	cin >> s1;
	if(s0 != n / 2 - s1){
		cout << "! " << 2 << " " << n - 1 << endl;
		return 0;
	}
	int right = n, left = 0;
	bool f = s0;
	while(right - left > 1){
		int mid = (right + left) / 2;
		cout << "? " << mid << endl;
		int s;
		cin >> s;
		if(s * 2 == mid){
			if(mid * 2 > n) cout << "! " << 1 << " " << mid << endl;
			else cout << "! " << mid + 1 << " " << n << endl;
			return 0;
		}
		if((s * 2 > mid) == f) left = mid;
		else right = mid;
	}
}