#include <iostream>

int multiply_by_two(int v)
{
	return v * 2;
}
void print_hello_world()
{
	std::cout << "Hello, World!" << std::endl;
}

int main()
{
	print_hello_world();

	std::cout << "The meaning of life is " << multiply_by_two(21) << std::endl;
}