Phil Anthropist likes to give away money. One day he went to the park with a wad of cash. He gave $100 to a man feeding pigeons. He then gave half of his remaining money to a child eating an ice-cream cone. He then gave $50 to the balloon seller. He then bought a hot dog and paid for it with a $20 bill. "Keep the change for a tip," he said to the hot-dog seller. Then he gave half his remaining money to someone giving a speech on a soapbox. At this point, he had $3 left and stuck it under the collar of a stray cat. How much money did Phil have when he started?