Lemonade Change LeetCode solution in Python

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class Solution:
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    def lemonadeChange(self, bills):
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        five = ten = 0
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        for num in bills:
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            if num == 5:
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                five += 1
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            elif num == 10 and five:
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                ten += 1
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                five -= 1
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            elif num == 20 and five and ten:
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                five -= 1
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                ten -= 1
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            elif num == 20 and five >= 3:
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                five -= 3
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            else:
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                return False
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        return True