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

### Instruction:
 当内森感到冷时，他会在床上加一床被子。每床被子能使他暖和3度。有一天晚上，他感到很冷，于是他把衣柜里一半的14床被子都加到了床上。这些被子使内森暖和了多少度？


### Response:
 内森在床上加了7床被子。
每床被子使他暖和3度，所以这些被子使他暖和了7 x 3 = <<21=21>>21度。