Complete the function to find the count of the most frequent item of an array. You can assume that input is an array of integers. For an empty array return `0`
## Example
```python
input array: [3, -1, -1, -1, 2, 3, -1, 3, -1, 2, 4, 9, 3]
ouptut: 5 
```
The most frequent number in the array is `-1` and it occurs `5` times.
from collections import Counter

def most_frequent_item_count(collection):
    return max(Counter(collection).values(), default=0)
from collections import Counter

def most_frequent_item_count(collection):
    return max(Counter(collection).values(), default=0)