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

### Instruction:
 玛丽亚的抽屉里有8支红色的钢笔。黑色的钢笔比红色的多10支。蓝色的钢笔比红色的多7支。一共有多少支钢笔？


### Response:
 蓝色的钢笔数量是8+7=<<8+7=15>>15支。
黑色的钢笔数量是8+10=<<8+10=18>>18支。
总共的钢笔数量是8+15+18=<<8+15+18=41>>41支。