题目描述
<p> The Fibonacci Numbers{0,1,1,2,3,5,8,13,21,34,55...} are defined by the recurrence: <br /> F0=0 F1=1 Fn=Fn-1+Fn-2,n>=2 <br /> Write a program to calculate the Fibonacci Numbers. </p>
输入格式
<p> Each case contains a number n and you are expected to calculate Fn.(0<=n<=30) 。 </p>
输出格式
<p> For each case, print a number Fn on a separate line,which means the nth Fibonacci Number. </p>
样例
样例输入 1
1
样例输出 1
1
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