Count Number Occurrences

Write a Python function `frequency(lst, num)` that takes a list of integers `lst` and an integer `num` as input and returns the number of times `num` appears in `lst`.

#### Example Usage
```python [main.nopy]
print(frequency([1, 2, 3, 4, 2, 2], 2))  # Output: 3
print(frequency([5, 5, 5, 5], 5))        # Output: 4
print(frequency([1, 2, 3], 4))           # Output: 0
```

#### Constraints
- The input list can contain any integers, including negative numbers.
- The function should return `0` if the number does not appear in the list.
def frequency(lst, num):
    """
    Count the number of occurrences of `num` in the list `lst`.

    Args:
    lst (list): A list of integers.
    num (int): The integer to count in the list.

    Returns:
    int: The count of occurrences of `num` in `lst`.
    """
    # Initialize a counter variable
    count = 0
    # Iterate through the list and count occurrences of `num`
    # Placeholder for the solution
    return count
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