7 lines
125 B
Python
7 lines
125 B
Python
a, b = 1, 1
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n = (a + 1) // 2
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while n < 10 ** 12:
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a, b = 3 * a + 4 * b, 2 * a + 3 * b
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n = (a + 1) // 2
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print (b + 1) // 2
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