import java.util.Arrays;
import java.util.Scanner;

public class Main {
	static int N, ans;
	static int[][] inning;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		N = sc.nextInt();
		ans = 0;
		inning = new int[N][9];

		for (int i = 0; i < N; i++) {
			for (int j = 0; j < 9; j++) {
				inning[i][j] = sc.nextInt();
			}
		}

		boolean[] v = new boolean[9];
		v[0] = true;
		setOrder(new int[9], 0, v);
		System.out.println(ans);
	}

	public static void setOrder(int[] order, int idx, boolean[] v) {
		if (idx == 3) {
			setOrder(order, idx + 1, v);
			return;
		}
		if (idx == order.length) {
			getScore(order, 0, 0, 0);
			return;
		}
		for (int i = 0; i < 9; i++) {
			if (!v[i]) {
				v[i] = true;
				order[idx] = i;
				setOrder(order, idx + 1, v);
				v[i] = false;
			}
		}
	}

	public static void getScore(int[] order, int score, int idx, int n) {
		if (n == N) {
			ans = Math.max(ans, score);
			return;
		}

		int out = 0;
		int index = -1;
		int[] loo = new int[3]; // 1루 2루 3루 홈
		while (out < 3) {
			for (int i = idx; i < 9; i++) {
				index = i + 1;
				int result = inning[n][order[i]];
				if (result == 0) { // 아웃
					out++;
					if (out >= 3)
						break;
				} else if (result == 1) { // 안타
					if (loo[2] != 0) {
						score++;
						loo[2] = 0;
					}
					loo[2] = loo[1];
					loo[1] = loo[0];
					loo[0] = 1;
				} else if (result == 2) { // 2루타
					for (int k = 1; k < 3; k++) {
						if (loo[k] != 0) {
							score++;
							loo[k] = 0;
						}
					}
					loo[2] = loo[0];
					loo[0] = 0;
					loo[1] = 1;
				} else if (result == 3) { // 3루타
					for (int k = 0; k < 3; k++) {
						if (loo[k] != 0) {
							score++;
							loo[k] = 0;
						}
					}
					loo[2] = 1;
				} else if (result == 4) { // 홈런
					score++; // 현재타자
					for (int k = 0; k < 3; k++) {
						if (loo[k] != 0) {
							score++;
							loo[k] = 0;
						}
					}
				}
			}
			idx = 0;
		}
		getScore(order, score, index, n + 1);
	}
}