1class Currency:
 2    def __init__(self, name, rate):
 3        self.name = name
 4        self.rate = rate
 5
 6    def __eq__(self, other):
 7        if not isinstance(other, Currency):
 8            return False
 9        return self.name == other.name and self.rate == other.rate
10    
11
12class PoliticalParty:
13    def __init__(self, name, motto, members=None, preferred_currency=None):
14        self.name = name
15        self._motto = motto
16        self.members = members if members is not None else []
17        self.preferred_currency = preferred_currency
18
19    @property
20    def motto(self):
21        return self._motto
22
23    def convert_currency_to_voters(self, amount, currency):
24        voters = int(amount / currency.rate)
25        
26        if self.preferred_currency == currency:
27            return voters * 2
28        return voters
29    
30    def __str__(self):
31        return self.name
32    
33    def __add__(self, other):
34        if isinstance(other, PoliticalParty):
35            return Coalition(self, other)
36        return NotImplemented
37
38
39class Coalition:
40    def __init__(self, *parties):
41        self._parties = list(parties)
42
43    @property
44    def members(self):
45        return {party.name: party.members for party in self._parties}
46    
47    def __add__(self, other):
48        if isinstance(other, PoliticalParty):
49            return Coalition(*(self._parties + [other]))
50        elif isinstance(other, Coalition):
51            return Coalition(*(self._parties + other._parties))
52        return NotImplemented
53    
54    def __str__(self):
55        return '-'.join([str(party) for party in self._parties])
56    
57
58class Elections:
59    _all_elections = {}
60
61    def __init__(self, year):
62        self.year = year
63        self.results = {}
64        Elections._all_elections[self.year] = self.results
65
66    def register_party_or_coalition(self, candidate):
67        if isinstance(candidate, (PoliticalParty, Coalition)):
68            name = str(candidate)
69            if name not in self.results:
70                self.results[name] = 0
71
72    def vote(self, candidate):
73        name = str(candidate)
74        if name in self.results:
75            self.results[name] += 1
76    
77    def rig_elections(self, candidate, amount, currency):
78        name = str(candidate)
79        if name not in self.results:
80            return
81        
82        if isinstance(candidate, PoliticalParty):
83            self.results[name] += candidate.convert_currency_to_voters(amount, currency)
84        elif isinstance(candidate, Coalition):
85            bought_votes = 0
86            for party in candidate._parties:
87                votes_from_party = party.convert_currency_to_voters(amount, currency)
88                if votes_from_party > bought_votes:
89                    bought_votes = votes_from_party
90            self.results[name] += bought_votes
91
92    def get_results(self):
93        return self.results
94    
95    @classmethod
96    def get_results_by_year(cls, year):
97        return cls._all_elections.get(year, {})