class TaulerSE:

    def __init__(self, nc):
        self.num_caselles = nc
        self.__sss = {}

    def nombre_serps(self):
        return len(self.__sss)

    def __getitem__(self, i):
        if i in self.__sss:
            return self.__sss[i]
        else:
            return 0

    def afegir_serp(self, cap, cua):
        self.__sss[cap] = cua