This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "grader.h"
#include<bits/stdc++.h>
using namespace std;
 
 
int HC(int n){
    int st = 1;
    int dr = n;
    Guess(1);
    int x = Guess(n);
    int prev = -1;
    while(st <= dr){
        int mij = (st + dr) >> 1;
        if(x == 0)
            return mij;
        else if(x > 0){
            st = mij + 1;
            if(prev == 0){
            x = Guess(st);
            x = -x;
            }
            else{
            Guess(st);
            x = Guess(dr);
            }
            prev = 1;
        }
        else{
            dr = mij;
            Guess(dr);
            x = Guess(st);
            x = -x;
            prev = 0;
        }
    }
    return st;
}
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