Midterm Question 2 (20%) - 2nd

Question

    Suppose there is a pair of newborn bunnies in the pasture in the first month, each pair of male and female bunnies grew into a large male and female rabbits after two months later. After three months from the start, each pair of male and female rabbit can give birth to a pair of small bunnies every month. If the rabbits can live forever, how many pairs of rabbits in the pasture in the first N month?

(1<=N<=90)(Very IMPORTANT)

Input

3

Output

2

 

Input

5

Output

5

 

Input

88

Output

1100087778366101931

Answer 1

Hidden content!
* * * *** ****


** *****


* n;
* *** int * * *

int i;
* * int b;






** * ** * *** **** ** **




* * ******* **

if *
* ** ** ** * ** *** * *

}
** if **
* ** * ****** ** ** **

}


*
** * * * *



}
*** *****


* ** *** ** *** * ***
** 0;}

Answer 2

Hidden content!
* * ** ** * ***



int ** *



int n;
* ** long int **

int i;


* * * ** * **** * *
** ***** * * **

if * *
* *** ** * **** ***** **** * *

else if *
**** * ** ** ** ** * *****
***
* * * * *



}




** ** *** ** * * * * *
* * 0;}

Answer 3

Hidden content!
* * ** ** ******



int **



int n;
** long int **

int i;


* ** ** * ** ***** *
* * * * ** * *

if **
* * * ** ** * * ** ** * *

else if **
* * * * * *** * * ** * *
*
**** * *



}




* * ********* ****** * ** *
** 0;}