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

### Instruction:
Diego baked 12 cakes for his sister's birthday. Donald also baked 4 cakes, but ate 1 while waiting for the party to start. How many cakes are left?

### Response:
 มีเค้กทั้งหมด 12 + 4 = <<12+4=16>>16 ชิ้น
แต่ดิเอโก้กินเค้ก 1 ชิ้น จึงเหลือเค้ก 16 - 1 = <<16-1=15>>15 ชิ้น