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# Runtime: 1834 ms (Top 5.30%) | Memory: 43.9 MB (Top 45.70%)
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class Bank:
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    def __init__(self, bal: List[int]):
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        self.store = bal  # storage list
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    def transfer(self, a1: int, a2: int, money: int) -> bool:
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        try:
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            # checking if both accounts exist. and if the transaction would be valid
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            if self.store[a1 - 1] >= money and self.store[a2 - 1] >= 0:
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                # performing the transaction
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                self.store[a1 - 1] -= money
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                self.store[a2 - 1] += money
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                return True
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            else:
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                # retrning false on invalid transaction
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                return False
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        except:
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            # returning false when accounts don't exist
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            return False
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    def deposit(self, ac: int, mn: int) -> bool:
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        try:
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            # if account exists performing transaction
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            self.store[ac - 1] += mn
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            return True
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        except:
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            # returning false when account doesn't exist
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            return False
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    def withdraw(self, ac: int, mn: int) -> bool:
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        try:
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            # checking if transaction is valid
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            if self.store[ac - 1] >= mn:
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                # performing the transaction
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                self.store[ac - 1] -= mn
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                return True
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            else:
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                # returning false in case on invalid transaction
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                return False
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        except:
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            # returning false when account doesn't exist
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            return False