#include "grader.h"
#include<iostream>
#include<vector>
using namespace std;
int ries1(int l, int r) {
if (r - l < 3) {
Guess(l);
int x = Guess(r);
if (x == 0) return (l + r) / 2;
if (x == -1) return l;
if (x == 1) return r;
}
Guess(l);
int p2 = l + ((r - l) / 3) * 2;
int x = Guess(p2);
if (x == -1) {
return ries1(l, (l+p2)/2 - ((l+p2) % 2 == 0));
}
if (x == 1) {
x = Guess(p2 + 1);
if (x == -1) return ries1((l + p2) / 2 + 1, p2);
if (x == 1) return ries1(p2 + 1, r);
}
if (x == 0) {
return (l + p2) / 2;
}
return -1;
}
int HC(int n) {
return ries1(1, n);
}
