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>
using namespace std;
typedef long long ll;
#define fi first
#define se second
typedef long double ld;
const ll inf = 1e9;
const ld eps = 1e-8;
const ll logs = 32;
#include <cmath>
ll c(ll k) {
cout << "? " << k << endl;
ll x;
cin >> x;
return x;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
ll n;
cin >> n;
ll lsz = 0, rsz = n;
ll last = n / 4 + 1;
ll x = c(last);
while (rsz - lsz > 1) {
ll sz = (rsz + lsz) / 2;
ll ind;
if (last + sz <= n)
ind = last + sz;
else
ind = last - sz;
x = c(ind);
if (x == 1) {
rsz = sz;
} else
lsz = sz;
last = ind;
}
cout << "= " << rsz << endl;
}
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