What’s the minimum amount of money you’d need to not cure cancer?

You have a magic button that when pressed will cure cancer forever. Every person with cancer will be instantly cured and humans won’t ever get any kind of cancer from that point on. The button will vanish after you press it and no one will ever know you were responsible. There are no catches.

What’s the minimum amount of money (if any) you would need to not press the button and lose the opportunity to cure cancer forever?

The money will be tax free and no one will question how or why you suddenly have it.

You have 20 minutes to decide in this scenario.