Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Write a function that will return the maximum of the following numbers.

### Input:
1, 5, 23, 9

### Response:
def find_max(nums):
    biggest = nums[0]
    for num in nums:
        if num > biggest:
            biggest = num
    return biggest

print(find_max([1, 5, 23, 9]))

Output: 23