<s>[INST] def find_max_revenue(prices, revenue, capacity):
    """
    This function calculates the maximum revenue that can be achieved by cutting a rod of length 'capacity' into pieces of lengths 'prices'.
    The 'prices' dictionary maps each length of the rod to its corresponding price.

    Parameters:
    prices (dict): A dictionary where keys are the lengths of the rod and values are the corresponding prices.
    revenue (list): A list where revenue[i] is the maximum revenue that can be achieved by cutting a rod of length i.
    capacity (int): The length of the rod.

    Returns:
    int: The maximum revenue that can be achieved by cutting a rod of length 'capacity'.
    """[/INST]