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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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nonlocal k
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k -= 1
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return A(k, B, x1, x2, x3, x4)
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return x4() + x5() if k <= 0 else B()
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print(A(10, lambda: 1, lambda: -1, lambda: -1, lambda: 1, lambda: 0))
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