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;}