1class Currency:
  2
  3    def __init__(self, currency, count):
  4        self.currency = currency
  5        self.count = count
  6
  7    def __eq__(self, other):
  8        if not isinstance(other, Currency):
  9            return False
 10        return self.currency == other.currency and self.count == other.count
 11
 12
 13class PoliticalParty:
 14
 15    def __init__(self, name, motto, members=None, preferred_currency = None):
 16        self.name = name
 17        self.__motto = motto
 18        self.members = members if members is not None else []
 19        self.preferred_currency = preferred_currency
 20
 21    @property
 22    def motto(self):
 23        return self.__motto
 24
 25    def convert_currency_to_voters(self, count, currency):
 26        coefficient_for_preferred_currency = 2
 27        if currency == self.preferred_currency:
 28            return int((count / currency.count) * coefficient_for_preferred_currency)
 29        return int(count / currency.count)
 30
 31    def __str__(self):
 32        return self.name
 33
 34    def __add__(self, other):
 35        return Coalition(self, other)
 36
 37
 38class Coalition:
 39
 40    def __init__(self, *args):
 41
 42        self.members = {}
 43        self.parties = set()
 44        for party in args:
 45            self.members[party.name] = party.members
 46            self.parties.add(party)
 47
 48    def __add__(self, other):
 49        all_parties = set(self.parties)
 50
 51        if isinstance(other, Coalition):
 52            all_parties.update(other.parties)
 53        if isinstance(other, PoliticalParty):
 54            all_parties.add(other)
 55        return Coalition(*all_parties)
 56
 57    def __str__(self):
 58        parties = list(self.parties)
 59        name = ""
 60        for party in parties:
 61            name += party.name + '-'
 62        return name[: len(name) - 1]
 63
 64class Elections:
 65
 66    __election_history = {}
 67
 68    def __init__(self, year):
 69        self.year = year
 70        self.parties_and_votes = {}
 71        self.__add_election(self, year)
 72
 73    def register_party_or_coalition(self, participant):
 74
 75        if str(participant) in self.parties_and_votes:
 76            return
 77        self.parties_and_votes[str(participant)] = 0
 78
 79    def vote(self, party):
 80        if str(party) not in self.parties_and_votes:
 81            return
 82        self.parties_and_votes[str(party)] += 1
 83
 84    def rig_elections(self, party, amount, currency):
 85
 86        if str(party) not in self.parties_and_votes:
 87            return
 88        best_trade = None
 89        if isinstance(party, Coalition):
 90
 91            for p in party.parties:
 92                best_trade = p
 93                if p.preferred_currency == currency.currency:
 94                    break
 95
 96        if isinstance(party, PoliticalParty):
 97            best_trade = party
 98
 99        self.parties_and_votes[str(party)] += best_trade.convert_currency_to_voters(amount, currency)
100
101    def get_results(self):
102        return dict(self.parties_and_votes)
103
104    @classmethod
105    def __add_election(cls,election,  year):
106        cls.__election_history[year] = election
107
108    @classmethod
109    def get_results_by_year(cls, year):
110        if year not in cls.__election_history:
111            return None
112        return cls.__election_history[year]