#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;

int main(){
	ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	freopen("road.in","r",stdin);
	freopen("road.out","w",stdout);
	cout<<0;
	return 0;
}//�������� 1 �� j �� k������ cj = 0 �Ҿ����� 1 �� i �� n ���� aj,i = 0��
