#include <iostream>
#include <vector>

// TODO: correctness proof

int main() {

	int n;
	std::cin >> n;

	int intervals = 0;
	int start = 0;
	std::string res;
	for( int i = 1; i <= n; i++ ) {
		std::cout << "? " << start << " " << i << std::endl;
		std::cin >> res;
		if(res == "absent") {
			intervals++;
			start = i;
		}
	}
	std::cout << "! " << intervals << std::endl;
	return 0;
}