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class Java {

    public static int add(int a, int b) {
        return a + b;
    }

    public static int subtract(int a, int b) {
        return a - b;
    }

    public static int multiply(int a, int b) {
        return a * b;
    }

    public static boolean isEven(int number) {
        return number % 2 == 0;
    }

    public static void main(String[] args) {

        int[] numbers = {2, 5, 8, 3, 6, 4, 7, 10};

        int sum = 0;

        for (int i = 0; i < numbers.length; i++) {
            sum = Java.add(sum, numbers[i]);
        }

        int product = Java.multiply(numbers[0], numbers[1]);
        product = Java.multiply(product, numbers[2]);

        int evenCount = 0;

        for (int i = 0; i < numbers.length; i++) {
            if (Java.isEven(numbers[i])) {
                evenCount++;
            }
        }

        System.out.println("Сумма всех чисел: " + sum);
        System.out.println("Произведение первых трех чисел: " + product);
        System.out.println("Количество четных чисел: " + evenCount);
        System.out.println("10 - 4 = " + Java.subtract(10, 4));
    }
}