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;}