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#include<stdio.h>
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int Fibon1(int n)
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{
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if (n == 1 || n == 2)
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{
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return 1;
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}
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else
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{
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return Fibon1(n - 1) + Fibon1(n - 2);
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}
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}
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int main()
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{
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int n = 0;
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int ret = 0;
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scanf("%d", &n);
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ret = Fibon1(n);
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printf("ret=%d", ret);
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return 0;
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}
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