My plans would probably cost a little more than 500 million, however, I'll give it a try. First, I would buy a rocket, invite all the leeches (meaning royal families, presidents and other scum) to their first free trip to the moon. Then when they're there, tell them: 'Oops, we forgot about the way back...sorry.' Leave them there with enough food and water to survive at least the rest of some of their lives. Then have a movie screen on every wall and ceiling in their luxurious rocket, playing 'Titanic' in a loop... I'd say that would be a huge problem solved. Then with the rest of the money, I'd probably empower more men, women and children around the world with food, (crypto)education, health care, etc. Anything left? Well, I'm sure we'll find something to do with it...(like meetup with Steemians all over the world)