Given 3 numbers, predict what the fourth number should be
3, 7, 13, 27, 53
If the number is on even position, then it's the previous number times two plus one. If it's on odd position, then it's the previous number times two minus one. Therefore, the next number is 53*2 + 1 = 107
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Given 3 numbers, predict what the fourth number should be

### Response:
If the number is on even position, then it's the previous number times two plus one. If it's on odd position, then it's the previous number times two minus one. Therefore, the next number is 53*2 + 1 = 107