/// @author Camillus <3
#ifndef LOCAL
#define debug(...) 42
#endif
#include "bits/stdc++.h"
using namespace std;

int query(int x, int y) {
    cout << "? " << x << " " << y << endl;
    int result;
    cin >> result;
    return result;
}

int answer(int s) {
    cout << "! " << s << endl;
    exit(0);
}


signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int R, C, L;
    cin >> R >> C >> L;

    int x, y;

    if (query(0, 0) <= query(0, 1)) {
        y = 0;
    } else {
        int l = 0, r = C;
        while (r - l > 1) {
            int m = (l + r) / 2;
            if (query(0, m) > query(0, m + 1)) {
                l = m;
            } else {
                r = m;
            }
        }
        y = r;
    }

    if (query(0, 0) <= query(1, 0)) {
        x = 0;
    } else {
        int l = 0, r = C;
        while (r - l > 1) {
            int m = (l + r) / 2;
            if (query(m, 0) > query(m + 1, 0)) {
                l = m;
            } else {
                r = m;
            }
        }
        x = r;
    }

    answer(query(x, y));
    return 0;
}