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#include <stdio.h>
main ()
{
int n;
scanf("%d",&n);
n = nfib(n);
printf("nfibs=%d\n",n);
exit(0);
}
nfib (n)
{
return(n <= 1 ? 1 : nfib(n-1) + nfib(n-2) + 1);
}
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