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

### Instruction:
Ashley had a birthday party and invited 20 of her friends, telling them to each invite one more person to attend the party. If half the number of the invited guests each came with one more person, what's the total number of people at the party, including Ashley?

### Response:
 จำนวนคนที่เชิญคือ 20 + 20 = <<20+20=40>>40
จำนวนคนที่มาคือ 40 / 2 = <<40/2=20>>20
จำนวนคนทั้งหมดในงานเลี้ยงคือแอชลีย์ + คนที่มาทั้งหมด คือ 1 + 20 = <<1+20=21>>21