//package timus;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Scanner;

public class p1127 {
    static int z[] = new int[90];
    public static void main(String[] args) {
        int t = 0;
        for (int y:"ABCGORSVWY".getBytes()) {
            z[y] = t++;
        }
        InputStream is = System.in;
        Scanner sc = new Scanner(new InputStreamReader(is));
        int N = sc.nextInt();
        int max = 0;
        for (int i=0; i<N; i++) {
            byte[]yn = sc.next().getBytes();
            for (int j=0; j<24; j++) {
                int a = x[j][0];
                int b = x[j][1];
                int c = x[j][2];
                int d = x[j][3];
                a = yn[a-1];
                b = yn[b-1];
                c = yn[c-1];
                d = yn[d-1];
                a = z[a];
                b = z[b];
                c = z[c];
                d = z[d];
                int h = hash(a,b,c,d);
                u[h]++;
                max = Math.max(max, u[h]);
            }
        }
        System.out.println(max);
    }
    static int u[] = new int[10000];
    static int[][] x = new int[][]{
        {1,3,4,2, 5,6},{2,1,3,4, 5,6},{4,2,1,3, 5,6},{3,4,2,1, 5,6},
        {3,5,2,6, 1,4},{6,3,5,2, 1,4},{2,6,3,5, 1,4},{5,2,6,3, 1,4},
        {3,1,2,4, 6,5},{4,3,1,2, 6,5},{2,4,3,1, 6,5},{1,2,4,3, 6,5},
        {5,1,6,4, 3,2},{4,5,1,6, 3,2},{6,4,5,1, 3,2},{1,6,4,5, 3,2},
        {5,3,6,2, 4,1},{2,5,3,6, 4,1},{6,2,5,3, 4,1},{3,6,2,5, 4,1},
        {5,4,6,1, 2,3},{1,5,4,6, 2,3},{6,1,5,4, 2,3},{4,6,1,5, 2,3}
    };
    //
    //front, right, left, back,     up, down
    static Integer hash(int a, int b, int c, int d) {
        return 1000 * a + 100 * b + 10 * c + d;
    }
}