#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
using namespace std;

int main() {
	int n, a, b, c, d;
	string r;
	int x[10] = { 1 };
	cin >> n;
	FOR(i, 0, n) {
		cin >> a >> b >> c >> d >> r;
		if (r == "YES") {
			x[a]++; x[b]++; x[c]++; x[d]++;
		}
		else {
			x[a] = x[b] = x[c] = x[d] = -n;
		}
	}
	int ans = 0;
	FOR(i, 0, 10) {
		if (x[i] >= ans) ans = i;
	}
	cout << ans << endl;

	return 0;
}