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;}