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;}