learn your jawa

class Main {
    public static void main(String[] args) {
        mul(3, 5);
        sayHello();
        System.out.println(10 + add(3, 5));
    }
    static void mul(double a, double b) {
        System.out.println(a * b);
    }
    static void sayHello() {
        System.out.println("Hello");
    }
    static double add(double a, double b) {
        return a + b;
    }
}