斐波那契数列定义如下：
\(\varphi_0=0, \varphi_1=1, ..., \varphi_{n}=\varphi_{n-1 }+\varphi_{n-2}\).
给定一个数字 \(n\ge 1\) define \(n\)th 斐波纳契数 \(\varphi_n\).
n
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