import java.io.*;

// Java 17: Sealed Classes
public sealed abstract class MaartenJava17 {
    public static void main(String[] args) throws IOException {
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
            new Solution().run(reader);
        }
    }
}

final class Solution extends MaartenJava17 {
    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;
            }
        }

        // Java 14: Switch Expression
        System.out.println(switch (42) {
            default -> "! " + ans;
        });
    }
}