A strawberry farmer will receive $22 per bushel of strawberries during the first week of harvesting. Each week after that, the value will drop $0.60 per bushel. The farmer estimates that there are approximately 116 bushels of strawberries in the fields, and that the crop is increasing at a rate of four bushels per week. When should the farmer harvest the strawberries to maximize their value? (Assume that "during the first week of harvesting" here means week 1.)