#include<bits/stdc++.h>
#define ll long long
#define endl '\n'
#define up(i,j,k,l) for(int i=j;i<=k;i+=l)
#define down(i,j,k,l) for(int i=j;i>=k;i-=l)
using namespace std;
extern "C" int Seniorious(int x);
extern "C" int Chtholly(int n,int c)
{
	(void)c;
	int res,t;
	int l=1,r=n;
	int mid;
	while(l<r){
		mid=(l+r)>>1;
		t=Seniorious(mid);
		if(t==0){
			return 	mid;
		}
		else if(t==1){
			l=mid+1;
			res=mid;
		}
		else{
			r=mid-1;
			res=mid;
		}
	}
	return res;
}
void solve()
{
	
	return;	
}
int main()
{
    //ios::sync_with_stdio(false);
	//cin.tie(0);
	//freopen(".in.in","r",stdin);
	//freopen(".out.out","w",stdout);
	int _=1;
	//cin>>_;
	up(i,1,_,1){
		solve();
	}
	return 0;
}