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

### Instruction:
A bag of caramel cookies has 20 cookies inside and a box of cookies has 4 bags in total. How many calories are inside the box if each cookie is 20 calories?

### Response:
If 1 bag has 20 cookies, then 1 box has 20*4=<<20*4=80>>80 cookies
If 1 cookie has 20 calories, then 80 cookies have 80*20= <<80*20=1600>>1600 calories
#### 1600