import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] S = new int[N][3];
		for (int i = 0; i < N; ++i) {
			int[] a = new int[3];
			for (int j = 0; j < 3; ++j) {
				a[j] = sc.nextInt();
			}
			Arrays.sort(a);
			for (int j = 0; j < 3; ++j) {
				S[i][j] = a[j];
			}
		}

		Arrays.sort(S, new Comparator<int[]>() {
			@Override
			public int compare(int[] arg0, int[] arg1) {
				if (arg0[0] != arg1[0])
					return Integer.compare(arg0[0], arg1[0]);
				else if (arg0[1] != arg1[0])
					return Integer.compare(arg0[1], arg1[1]);
				else
					return Integer.compare(arg0[2], arg1[2]);
			}
		});

		int[] dp = new int[N];
		dp[0] = 1;
		for (int i = 1; i < N; ++i) {
			for (int j = 0; j < i; ++j) {
				if (S[i][0] > S[j][1] && S[i][1] > S[j][1] && S[i][2] > S[j][2]) {
					dp[i] = Math.max(dp[i], dp[j] + 1);
				}
			}
		}
		int ans = 0;
		for (int i = 0; i < N; ++i) {
			ans = Math.max(ans, dp[i]);
		}
		System.out.println(ans);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}