Calculate the 4th Fibonacci number.
The 4th Fibonacci number is 3.

Explanation: The Fibonacci sequence is a series of numbers where a number is the sum of the two numbers before it. The first two numbers in the sequence are 0 and 1. The sequence goes: 0, 1, 1, 2, 3, 5, 8, 13, and so on.

So, to calculate the 4th Fibonacci number, we start with the first two numbers, 0 and 1. 
The third number is 0 + 1 = 1
The fourth number is 1 + 1 = 2
The fifth number is 2 + 1 = 3

Therefore, the 4th Fibonacci number is 3.
Below is an instruction that describes a task, write a response that appropriately completes the request.

### Instruction:
Calculate the 4th Fibonacci number.

### Response:
The 4th Fibonacci number is 3.

Explanation: The Fibonacci sequence is a series of numbers where a number is the sum of the two numbers before it. The first two numbers in the sequence are 0 and 1. The sequence goes: 0, 1, 1, 2, 3, 5, 8, 13, and so on.

So, to calculate the 4th Fibonacci number, we start with the first two numbers, 0 and 1. 
The third number is 0 + 1 = 1
The fourth number is 1 + 1 = 2
The fifth number is 2 + 1 = 3

Therefore, the 4th Fibonacci number is 3.