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 Guess (int x);
 
int HC(int N){
int st=1,dr=N;
Guess(st);
int a = Guess(dr);
while(st!=dr){
	int mij = (st+ dr) >> 1;
	if(a==-1){
		dr= mij;
		Guess(st);
		a = Guess(dr);
		if(a == 0)
		return mij;
	}
	else if(a==1){//close to l
		st = mij + 1;
		Guess(st);
		a = Guess(dr);
		if(a == 0)
		return mij;
	}
	else return mij;
}
return st;
}
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