def get_oil_price(hp):
    """
    Arg:
        hp (int): horsepower of tugs

    Return:
        price (float): oil price ($/km)
    """
    hp_price = {
        1800: 134.1075498270909,
        2400: 185.0696699493183,
        3200: 257.887743955886,
        3300: 267.3812284262817,
        3400: 276.9616518343608,
        3500: 286.6290141801232,
        3600: 296.3833154635688,
        4000: 336.2699099741844,
        4200: 356.734840855592,
        4400: 377.5475274877326,
        4500: 388.0842792103279,
        5200: 464.2758315236272,
        6400: 604.8009600994644,
    }
    return hp_price[hp]