import java.io.*;

public class Maarten {
    public static void main(String[] args) throws IOException {
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
            new Maarten().run(reader);
        }
    }

    public void run(BufferedReader reader) throws IOException {
        int n = Integer.parseInt(reader.readLine());
        int ans = 0;
        int i = 0;

        for (int j = 1; j <= n; j++) {
            System.out.println(String.format("? %d %d", i, j));
            if (reader.readLine().equals("absent")) {
                ans += 1;
                i = j;
            }
        }

        System.out.println("! " + ans);
    }
}