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;}