#include <bits/stdc++.h>
using namespace std;
int calc(int i, int x) {
    return x - (i - x);
}
int main () {
    int N;
    cin >> N;
    int b = N / 2;
    int a = N / 4;
    int c = a + b;
    int p, q, r;
    cout << "? " << a << endl;
    cin >> p;
    cout << "? " << b << endl;
    cin >> q;
    cout << "? " << c << endl;
    cin >> r;
    p = calc(a, p);
    q = calc(b, q);
    r = calc(c, r);
    if (p == 0) {
        cout << "! " << a + 1 << " " << N << endl;
        cin >> N;
        if (N == -1) {
            return 139;
        }
        return 0;
    }
    if (q == 0) {
        cout << "! " << b + 1 << " " << N << endl;
        cin >> N;
        if (N == -1) {
            return 139;
        }
        return 0;
    }
    if (r == 0) {
        cout << "! " << 1 << " " << c << endl;
        cin >> N;
        if (N == -1) {
            return 139;
        }
        return 0;
    }
    if (p == r) {
        cout << "! " << a + 1 << " " << c << endl;
        int x;
        cin >> x;
        if (x == -1) {
            return 139;
        }
        return 0;
    }
    int mi = 1;
    int ma = a;
    if ((p > 0) != (q > 0)) {
        mi = a;
        ma = b;
        while (mi != ma) {
            int mu = (mi + ma) / 2;
            cout << "? " << mu << endl;
            int x;
            cin >> x;
            if (x == -1) {
                return 139;
            }
            x = calc(mu, x);
            if (x == 0) {
                ma = mi = mu;
            }
            if ((p > 0) == (x > 0)) {
                mi = mu + 1;
            } else {
                ma = mu - 1;
            }
        }
        cout << "! " << mi + 1 << " " << N << endl;
        int x;
        cin >> x;
        if (x == -1) {
            return 139;
        }
        return 0;
    }
    if ((q > 0) != (r > 0)) {
        mi = b;
        ma = c;
        while (mi != ma) {
            int mu = (mi + ma) / 2;
            cout << "? " << mu << endl;
            int x;
            cin >> x;
            if (x == -1) {
                return 139;
            }
            x = calc(mu, x);
            if (x == 0) {
                ma = mi = mu;
            }
            if ((q > 0) == (x > 0)) {
                mi = mu + 1;
            } else {
                ma = mu - 1;
            }
        }
        cout << "! " << 1 << " " << mi << endl;
        int x;
        cin >> x;
        if (x == -1) {
            return 139;
        }
        return 0;
    }
    if (abs(r) > abs(p)) {
        mi = c;
        ma = N;
        swap(r, p);
    }
    while (ma != mi) {
        int mu = (ma + mi) / 2;
        cout << "? " << mu << endl;
        int x;
        cin >> x;
        if (x == -1) {
            return 139;
        }
        x = calc(mu, x);
        if (x == r) {
            ma = mi = mu;
        } else if ((x < r) == (x < p)) {
            if (mi >= c) {
                ma = mu;
            } else {
                mi = mu + 1;
            }
        } else {
            if (mi >= c) {
                mi = mu + 1;
            } else {
                ma = mu;
            }
        }
    }
    if (mi >= c) {
        cout << "! " << a + 1 << ' ' << mi << endl;
    } else {
        cout << "! " << mi + 1 << " " << c << endl;
    }
}