Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 每周，卡琳娜在罐子里放入比上周多20个海贝。如果这周罐子里有50个海贝，一个月后会有多少个？


### Response:
 一周后会有50+20=<<50+20=70>>70个海贝
两周后会有70+20=<<70+20=90>>90个海贝
三周后会有90+20=<<90+20=110>>110个海贝
四周后会有110+20=<<110+20=130>>130个海贝