#include <stdio.h>

#define MAX 42

/*
 * Compute the nth Fibonacci number inefficiently.
 */
long fib(int n)
{
  if (n < 2) return n;
  else return fib(n-1) + fib(n-2);
} // fib(int n)

/*
 * Compute some Fibonacci numbers.
 */
int main()
{
  printf("Fibonacci number %d is %ld.\n",
         MAX, fib(MAX));
  exit(0);
} // main()