# Array Packing

You are given an array of up to four non-negative integers, each less than `256`

.

Your task is to pack these integers into one number `M`

in the following way:

- The first element of the array occupies the first
`8`

bits of`M`

; - The second element occupies next
`8`

bits, and so on.

Return the obtained integer `M`

.

Note: the phrase *"first bits of M"* refers to the

*least significant bits*of

`M`

- the right-most bits of an integer. For further clarification see the following example.## Example

For `a = [24, 85, 0]`

, the output should be

`array_packing(a) = 21784`

An array `[24, 85, 0]`

looks like `[00011000, 01010101, 00000000]`

in binary. After packing these into one number we get `00000000 01010101 00011000`

(spaces are placed for convenience), which equals to `21784`

.

## Input/Output

**[input] array.integer a***Guaranteed constraints:*`1 ≤ a.length ≤ 4`

,`0 ≤ a[i] < 256`

.

## Solution

py

```
def array_packing(a):
return int(
''.join(
[
format(i, 'b').zfill(8)
for i in reversed(a)
]
), 2)
print(array_packing([24, 85, 0]))
```