#include <stdio.h>
#include <time.h>

long fib (int n) { 
    return n <= 1 ? 1 : fib(n-1) + fib(n-2);
}

int main () {
    double x;
    int n;

    for (n = 35; n < 46; ++n) {
        x = clock();
        printf("Fab %d is %ld in ", n, fib(n));
        printf(" %fs\n", (clock()-x)/CLOCKS_PER_SEC);
    }

    return 0;
}




