import java.util.Scanner;

class MagicSquareCheck {

    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the dimension of the square matrix: ");
        int n = sc.nextInt();
        int a[][] = new int[n][n];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                System.out.print(
                    "Enter the element at (" + i + "," + j + "): "
                );
                a[i][j] = sc.nextInt();
            }
        }

        // sum of the first row (to have a baseline sum)
        int sum = 0;
        for (int j = 0; j < n; j++) {
            sum += a[0][j];
        }

        // rows, columns, and diagonals
        boolean isMagicSquare = true;
        int diag1 = 0, diag2 = 0;

        for (int i = 0; i < n; i++) {
            int rowSum = 0, colSum = 0;
            diag1 += a[i][i];
            diag2 += a[i][n - 1 - i];

            for (int j = 0; j < n; j++) {
                rowSum += a[i][j];
                colSum += a[j][i];
            }

            if (rowSum != sum || colSum != sum) {
                isMagicSquare = false;
                break;
            }
        }

        if (diag1 != sum || diag2 != sum) {
            isMagicSquare = false;
        }

        if (isMagicSquare) {
            System.out.println("The matrix is a magic square.");
        } else {
            System.out.println("The matrix is not a magic square.");
        }
    }
}