Hypothetically speaking, if your death would save the life of one or more complete strangers that you know nothing about, how many people would need to be saved (if any) in order for you to give up your own life?
EDIT: Your death would be painless and instantaneous.
At least two. A cell population never survived if their mitosis only splits them into a single cell. Think of me as a cell going through mitosis. If I’m bargaining, I like to increase my legacy in the process.