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

### Instruction:
 斯特凡、维尔和爱国收集了海贝壳。斯特凡比维尔多16个海贝壳。维尔比爱国少5个海贝壳。爱国有20个海贝壳。这3个孩子总共有多少个海贝壳？


### Response:
 爱国 = <<20=20>>20个海贝壳
维尔 = 20 - 5 = <<20-5=15>>15个海贝壳
斯特凡 = 15 + 16 = <<15+16=31>>31个海贝壳
总共 = 20 + 15 + 31 = <<20+15+31=66>>66个
这3个孩子总共有66个海贝壳。