#include <bits/stdc++.h>

using namespace std;

int n;

vector<int> edge[10010];

char str[10010][5][14];

int main (){
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%s%s%s%s", str[i][0] + 1, str[i][1] + 1, str[i][2] + 1, str[i][3] + 1);
	}
	printf("0\n");
	return 0;
}