【例48.1】 斐波那契数列
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说明
输出斐波那契数列第项。，，，，，，……
输入格式
一个正整数,表示第项。
输出格式
第项是多少。
样例
43
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
输出斐波那契数列第项。，，，，，，……
一个正整数,表示第项。
第项是多少。
43