#include "prize.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define OK puts("OK");
#define NO puts("NO");
#define YES puts("YES");
#define fr first
#define sc second
#define ret return
#define scanl(a) scanf("%lld",&a);
#define scanll(a,b) scanf("%lld %lld",&a, &b);
#define scanlll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);
#define scan1(a) scanf("%d",&a);
#define scan2(a,b) scanf("%d %d",&a, &b);
#define scan3(a,b,c) scanf("%d %d %d",&a,&b,&c);
#define all(s) s.begin(),s.end()
#define allr(s) s.rbegin()Ñ,s.rend()
#define pb push_back
#define sz(v) (int)v.size()
#define endi puts("");
#define eps 1e-12
const int N = 3e5+12,INF=1e9+7;
int find_best(int n) {
priority_queue <pii> q;
q.push({0,n-1});
while (!q.empty()){
int l = q.top().fr,r = q.top().sc;
q.pop();
if (l == r){
vector <int> v = ask(r);
if (v[0] == 0 && v[1] == 0){
ret l;
}
}
else {
int m = (l+r>>1);
vector <int> v = ask(m);
if (v[0] > 0){
if (m >= l)
q.push({l,m});
}
if (v[1] > 0){
if (m <= r){
q.push({m,r});
}
}
}
}
return 0;
}
