绳子原来长多少厘米 - Problem - CGOJ

Problem E: 绳子原来长多少厘米

Problem E: 绳子原来长多少厘米

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Time Limit : 1.000 sec Memory Limit : 128 MiB

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Description

一根绳子对折两次后，每段长 a 厘米，绳子原来长多少厘米

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