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class Cake:
    def __init__(self, price, volume, condition):
        self.price_gram = price / volume
        self.volume = volume
        self.con = condition

    def __eq__(self, other):
        if isinstance(other, Cake):
            return self.price_gram == other.price_gram
        return False

    def __lt__(self, other):
        if isinstance(other, Cake):
            return self.price_gram < other.price_gram
        return False

def Calculate(data):
    result = 0
    for cake in data:
        if cake.volume > conditions[1]:
            if cake.con:
                result += cake.price_gram * conditions[1]
                return result
            else: continue
        else:
            result += cake.price_gram * cake.volume
            conditions[1] -= cake.volume
    return result

conditions = list(map(int, input().split()))
data = []
for i in range(conditions[0]):
    auxiliary = input().split()
    data.append(Cake(int(auxiliary[0]), int(auxiliary[1]), auxiliary[2] == 'Д'))
data.sort(reverse=True)
print("{:.2f}".format(Calculate(data)))