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;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
#define F first
#define S second
#define pb push_back
#define all(v) v.begin(),v.end()
#define pow poww
const ll M=1e5+10;
const ll inf=2e18;
const ll mod=1e9+7;
ll pow(ll x,ll y){
ll res=1;
x%=mod;
while(y>0){
if((y&1))
res*=x,res%=mod;
x*=x,x%=mod;
y=(y>>1);
}
return res;
}
ll n,ans,cn;
bool ask(ll x){
cout<<"? "<<x<<endl;
bool c;
cin>>c;
return c;
}
void ret(ll x){
cout<<"= "<<x<<endl;
}
int main(){
ios_base::sync_with_stdio(0),cin.tie(0);
ll TC=1;
//cin>>TC;
while(TC--){
cin>>n;
ask(1);
ll cur=1;
for(int i=n-1;i>=1;i--){
if((n-i)%2==1){
if(!ask(cur+i)){
ret(i+1);
return 0;
}
cur+=i;
}
else{
if(!ask(cur-i)){
ret(i+1);
return 0;
}
cur-=i;
}
}
ret(1);
}
return 0;
}
/*
*/
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