import java.util.Scanner;

public class E {

    static int lmax(int[][] a, int n, int max) {
        for (int i = 0; i < n; i++) {
            int b = 0;
            for (int j = 0; j < n; j++) {
                b += a[j][i];
            }
            max = Math.max(max, b);
        }
        return max;
    }

    static int[][] yy(int[][] a, int b, int n) {
        int c = a[b][n - 1];
        for (int j = n - 1; j > 0; j--) {
            a[b][j] = a[b][j - 1];
        }
        a[b][0] = c;
        return a;
    }

    static int yy2(int[][] a, int[][] z, int b, int n, int c) {
        for (int i = 0; i < n; i++) {
            if (a[b][i] != z[b][i]) {
                c = 0;
                return c;
            }
        }
        return c;
    }

    public static void main(String[] args) {
        while (cin.hasNext()) {
            int n = cin.nextInt();
            if (n == -1) break;
            int[][] m = new int[n][n];
            int[][] z = new int[n][n];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < n; j++) {
                    m[i][j] = cin.nextInt();
                    z[i][j] = m[i][j];
                }
            }
            int max, a, b;
            max = 0;
            int min = lmax(m, n, max);
            for (int i = 1; i < Math.pow(n, n); i++) {
                b = 0;
                m = yy(m, b, n);
                a = 1;
                a = yy2(m, z, b, n, a);
                while (a == 1 && b + 1 < n) {
                    b++;
                    m = yy(m, b, n);
                    a = yy2(m, z, b, n, a);
                }
                max = 0;
                max = lmax(m, n, max);
                min = Math.min(min, max);
            }
            System.out.println(min);
        }
        cin.close();
    }

    static Scanner cin = new Scanner(System.in);
}