#include <bits/stdc++.h>
#include "prize.h"
#ifdef ONPC
#include "t_debug.cpp"
#else
#define debug(...) 42
#endif
#define sz(a) ((int)(a).size())
using namespace std;
using ll = long long;
const int INF = 1e9;
const ll INFL = 1e18;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U>& p) { return is >> p.first >> p.second; }
const int N = 2e5, LOGN = 17, MOD = 1e9+7;
int find_best(int n) {
int l = 0, r = n-1;
while (l <= r) {
int mid = (l + r) / 2;
vector<int> res = ask(mid);
if (res[0] + res[1] == 0) {
return mid;
} else if (res[0] == 0) {
l = mid + 1;
} else {
r = mid - 1;
}
}
assert(false);
}
/*
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*/
