#include <cassert>
#include <iostream>
#include <set>
using namespace std;

typedef long long ll;

int main() {
	// c++20 test
	set<int> s = {1, 2};
	assert(s.contains(2));
	assert(string("ans").starts_with("a"));

	ll n;
	cin >> n;
	ll r = 0;
	ll a = 0;
	for (ll i = 1; i <= n; i++) {
		cout << "? " << a << " " << i << endl;
		string b;
		cin >> b;
		if (b == "absent") {
			r++;
			a = i;
		}
	}
	cout << "! " << r << endl;
}