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

### Instruction:
While reading in bed with his wife Susan, Charlie heard a noise at the door. It was Sarah entering the bedroom with 4 friends. If there were also 8 people in the living room, how many people are in the house?

### Response:
In the bedroom, there are 1 + 1 = <<1+1=2>>2 people in the house (Charlie and Susan).
Sarah and four friends then entered, a total of 4+1 = <<4+1=5>>5 people.
Together with Charlie and Susan, there are now 5+2 = 7 people in the bedroom.
Since there are 8 more people in the living room, the total number of people in the house is 7+8 = <<7+8=15>>15
#### 15