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

### Instruction:
 总共采摘了42个覆盆子、黑莓和蓝莓。如果一半的浆果是覆盆子，三分之一的浆果是黑莓，那么有多少个是蓝莓？


### Response:
 如果42个浆果中有一半是覆盆子，那么就有42/2 = <<42/2=21>>21个覆盆子。
如果三分之一的浆果是黑莓，那么就有42/3 = <<42/3=14>>14个黑莓。
如果剩下的浆果是蓝莓，那么就有42-21-14 = <<42-21-14=7>>7个蓝莓。