#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
int find_best(int n) {
int cur = 0;
int cnt = 0;
while (true) {
cnt++;
assert(cnt <= 10000);
vector<int> res1 = ask(cur);
if (res1[0] + res1[1] == 0) {
return cur;
}
int lt = cur + 1;
int rt = n - 2;
while (lt <= rt) {
int mt = (lt + rt) / 2;
cnt++;
assert(cnt <= 10000);
vector<int> res2 = ask(mt);
if (res2[0] + res2[1] == 0) {
return mt;
}
if (res2[1] == res1[1]) {
cur = mt;
lt = mt + 1;
}
else {
rt = mt - 1;
}
}
cur++;
}
return -1;
}
