1class Currency:
 2    def __init__(self, name, amount_per_vote):
 3        self.name = name
 4        self.amount_per_vote = amount_per_vote
 5
 6    def __eq__(self, other):
 7        if not isinstance(other, Currency):
 8            return False
 9        return self.name == other.name and self.amount_per_vote == other.amount_per_vote
10
11class PoliticalParty:
12    def __init__(self, name, motto, members=[], preferred_currency=None):
13        self.name = name
14        self.__motto = motto
15        self.members = members
16        self.preferred_currency = preferred_currency
17
18    @property
19    def motto(self):
20        return self.__motto
21
22    def convert_currency_to_voters(self, amount, currency):
23        votes = int(amount / currency.amount_per_vote)
24        if currency == self.preferred_currency:
25            return votes * 2
26        return votes
27
28    def __str__(self):
29        return self.name
30
31    def __add__(self, other):
32        return Coalition(self, other)
33
34class Coalition:
35    def __init__(self, *political_parties):
36        self.political_parties = list(political_parties)
37
38    @property
39    def members(self):
40        return {party.name: party.members for party in self.political_parties}    
41
42    def __add__(self, other):
43        if isinstance(other, PoliticalParty):
44            return Coalition(*self.political_parties, other)
45        if isinstance(other, Coalition):
46            return Coalition(*self.political_parties, *other.political_parties)
47    
48    def __str__(self):
49        return "-".join(str(political_party) for political_party in self.political_parties)
50
51class Elections:
52    _memory = {}
53
54    def __init__(self, year):
55        self.year = year
56        self.votes = {}
57        type(self)._memory[year] = self
58
59    def register_party_or_coalition(self, participant):
60        self.votes[participant] = 0
61
62    def vote(self, participant):
63        if participant in self.votes:
64            self.votes[participant] += 1
65
66    def rig_elections(self, participant, amount, currency):
67        if participant in self.votes:
68            if isinstance(participant, PoliticalParty):
69                votes = participant.convert_currency_to_voters(amount, currency)
70            if isinstance(participant, Coalition):
71                votes = max(political_party.convert_currency_to_voters(amount, currency) for political_party in participant.political_parties)
72            self.votes[participant] += votes
73    
74    def get_results(self):
75        return {str(participant): votes for participant, votes in self.votes.items()}
76
77    @classmethod
78    def get_results_by_year(cls, year):
79        if year in cls._memory:
80            return cls._memory[year].get_results()
81        return {}