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1#include <stdio.h> 2 3unsigned long long fib(unsigned long long n) { 4 if (n==0)return 0; 5 if (n==1)return 1; 6 return fib(n-1)+fib(n-2); 7} 8 9int main(void) { 10 printf("%lld\n", fib(40)); 11}