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#!/usr/bin/env python
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import sys
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sys.setrecursionlimit(1025)
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def a(k, x1, x2, x3, x4, x5):
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def b():
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b.k -= 1
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return a(b.k, b, x1, x2, x3, x4)
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b.k = k
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return x4() + x5() if b.k <= 0 else b()
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x = lambda i: lambda: i
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print(a(10, x(1), x(-1), x(-1), x(1), x(0)))
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