#include <iostream>
using namespace std;
int n,ans;
int main() {
	cin>>n;
	int l=1;
	for(int r=1;r<=n;r++){
		while(l<r){
			cout<<"? "<<l<<" "<<r<<endl;
			string s;
			cin>>s;
			if(s=="No"){
				l++;
			}else{
				break;
			}
		}
		ans+=r-l;
	}
	cout<<"! "<<ans;
	return 0;
}