import java.util.*;
import java.io.*;
import java.text.*;

public class NickyEnMark{
    public static void main(String[] args) throws IOException {
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
            String line = reader.readLine();
            int n = Integer.parseInt(line);
            int numAbsent = 0;
            int l = 0;
            int h = 1;
            for (int i = 0; i < n; i++) {
                System.out.println("? " + l + " " + h);
                System.out.flush();
                String ans = reader.readLine();
                if (ans.equals("absent")) {
                    numAbsent++;
                    l = h;
                    h = l + 1;
                } else {
                    h++;
                }
            }

            System.out.println("! " + numAbsent);
            System.out.flush();
        }
    }
}