500
1. Searching to kill his wifes killer after losing his ability to make new memories
2. Helps #1 on his journey because she understands what its like to lose someone.
3. #1's wife's killer whose real name is John.
4. A man who cannot form new memories after an accident. He is told by his insurance company that they cant support him for his mental health bills. His wife commits suicide by too many insulin shots.
Who are leonard, natalie, teddy, and sammy?