import java.util.*;

public class MagicSquare {

    public static void main(String[] args) {
        int[][] magicSquare = {
            {2, 7, 6},
            {9, 5, 1},
            {4, 3, 8}
        };
        System.out.println(isMagicSquare(magicSquare));
    }

    public static boolean isMagicSquare(int[][] square) {
        int length = square.length;

        int[][] rows = square;
        int[][] columns = new int[length][length];
        int[][] diagonals = new int[2][length];

        for (int i = 0; i < length; i++) {
            for (int j = 0; j < length; j++) {
                columns[i][j] = square[j][i];
            }
            diagonals[0][i] = square[length-(length-i)][length-(length-i)];
            diagonals[1][i] = square[length-(length-i)][length-(length-(length-(i+1)))];
        }

        return sumEquals(rows) && sumEquals(columns) && sumEquals(diagonals);
    }

    public static boolean sumEquals(int[][] tab) {
        int sum = sum(tab[0]);
        for (int[] row : tab) {
            if (sum != sum(row)) {
                return false;
            }
        }
        return true;
    }

    public static int sum(int[] tab) {
        return Arrays.stream(tab).sum();
    }

}