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

### Instruction:
Caleb is baking a birthday cake for his grandfather. His grandfather is turning 79 years old. Caleb puts three colors of candles on the cake. He puts one candle for each year for his grandfather. He puts 27 yellow candles, 14 red candles and the rest are blue candles. How many blue candles did he use?

### Response:
Caleb has put 27 + 14 = <<27+14=41>>41 yellow and red candles.
So, he used 79 - 41 = <<79-41=38>>38 blue candles.
#### 38