class Assessment {

    public static void main(String[] args) {

        int n = 4;
        printTriangle(n);

    }

    public static void printTriangle(int n) {
        int[][] arr = new int[4][4];

        for (int i = 0; i < n; i++) {
            for (int j = n - i; j > 1; j--) {
                System.out.print(" ");
            }

            for (int j = 0; j <= i; j++) {
                int random = (int) (Math.random() * 9) + 1;
                arr[i][j] = random;
                System.out.print(random + " ");
            }
            System.out.println();
        }
        printArray(arr);
    }

    public static void printArray(int[][] array){
        
        for (int i = 0; i < array.length; i++) {
            for (int j = 0; j < array.length; j++) {
                System.out.print(array[i][j] + " ");
            }
            System.out.println();
        }
        maxSum(array);
    }

    public static void maxSum(int[][] array){
        
        int maxSum = 0;
        int max = 0;

        for (int i = 0; i < array.length; i++) {
            max = 0;
            for (int j = 0; j < array.length; j++) {
                 if(!checkPrime(array[i][j]) && (max < array[i][j])){
                     maxSum += array[i][j];
                     max = array[i][j];
                     System.out.println("MAX: " + max);
                 }
            }
            System.out.println();
        }
        System.out.println(maxSum);
    }

    public static boolean checkPrime(int a) {
        int temp;
        boolean isPrime = true;
        int num = a;
        for (int i = 2; i <= num / 2; i++) {
            temp = num % i;
            if (temp == 0) {
                isPrime = false;
                break;
            }
        }
        return isPrime;
    }


}