#include "prize.h"
#include <bits/stdc++.h>
#define pb push_back
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
int ans = -1, cnt = 0, mx = 0;
vector<int> doask(int i){
vector<int> v = ask(i);
if(v[0] == 0 && v[1] == 0) ans = i;
return v;
}
void solve(int l, int r){
if(ans != -1) return;
if(r - l == 1){
vector<int> v = doask(l);
if(v[0] + v[1] < mx) cnt++;
return;
}
int m = (l + r) >> 1, t = 0, rm = m;
vector<int> v;
while(m < r){
v = doask(m);
if(v[0] + v[1] == mx) break;
t++;
m++;
}
if(v[0] > cnt + t) solve(l, rm);
cnt += t;
if(m + 1 < r) solve(m + 1, r);
}
int find_best(int n) {
for(int i = 0; i < min(n, 700); i++){
vector<int> v = ask(i);
if(v[0] + v[1] > mx) mx = v[0] + v[1];
}
solve(0, n);
return ans;
}
