This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
typedef long long int ll;
using namespace std;
int main(){
ll n; cin >> n;
cout << "? 1" << endl;
bool noticed;
cin >> noticed;
ll l = 1, r = n;
while (l <= r){
ll mid = l + (r-l)/2;
cout << "? " << mid << endl;
cin >> noticed;
if (noticed) r = mid-1;
else l = mid+1;
}
cout << "= " << (r+1) << endl;
return 0;
}
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