You are a garbage truck driver. When you drive a truck, you have an important goal. One of them is to drive the truck carefully to avoid hitting anywhere. Another goal is to collect all the garbage bags on the street. The road you have walked is deserted. Your job is to separate the things that may hurt your truck from the garbage bags that you must pick up. Every garbage bag you pick up will bring money, and everything you encounter will carry your truck. If the service panel expires, you will not be able to run it. But you can continuously improve the strength, supply, control and additional capacity of the truck to work better!