#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    cout << "? " << N/2 << endl;
    int S;
    cin >> S;
    if(S == 0) {
        cout << "! " << 1 << " " << N/2 << endl;
        return 0;
    }
    if(S == N/2) {
        cout << "! " << 2 << " " << N-1 << endl;
        return 0;
    }
    int l = N/2,r = N+1;
    while (l < r) {
        int mid = (l+r)/2;
        cout << "? " << mid << endl;
        int a;
        cin >> a;
        if(a == 0) {
            cout << "! " << 1 << " " << mid << endl;
            return 0;
        }
        if(a < 0 && S > 0) {
            r = mid;
            continue;
        }
        if(a > 0 && S < 0) {
            r = mid;
            continue;
        }
        if(N-mid == abs(a)) {
            r = mid;
            continue;
        }
        l = mid;
    }
    cout << "! " << 1 << " " << r << endl;
}