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user_8840555
python
6 months ago
206 B
1
Indexable
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import sys
from functools import lru_cache

sys.setrecursionlimit(3000)
@lru_cache
def f(x):
    if x >= 4040:
        return x
    if x < 4040:
        return x + 4 + f(x + 4)
print(f(3) - f(15))

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