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

### Instruction:
 正在建造两堵砖墙。每堵墙有30块砖，每堵墙有50排。用来建造两堵墙需要多少块砖？


### Response:
 每堵砖墙需要30 x 50 = <<30*50=1500>>1500块砖。
因此，两堵墙需要1500 x 2 = <<1500*2=3000>>3000块砖。