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31 lines
500 B
31 lines
500 B
#include <stdio.h>
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#include <stdlib.h>
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unsigned long int
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fib(unsigned long int n)
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{
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if (n <= 1) return n;
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return fib(n - 1) + fib(n - 2);
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}
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int
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main(int argc, char **argv)
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{
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unsigned long n = 0;
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scanf("%lu", &n);
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//size_t rd = read(0, recv_buf, 1000*1024);
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//if (rd <= 0) return -1;
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// unsigned long long st = get_time(), en;
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//r = fib(30);
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// en = get_time();
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for (int i = 0; i < 3; i++)
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{
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n = fib(n);
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}
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printf("%lu\n", n);
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return 0;
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}
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