Description

In how many ways can you tile a 3xn rectangle with 2x1 dominoes? 
Here is a sample tiling of a 3x12 rectangle. 
 

Input

Input consists of several test cases followed by a line containing -1. Each test case is a line containing an integer 0 ≤ n ≤ 30. 

Output

For each test case, output one integer number giving the number of possible tilings. 

Sample Input

2
8
12
-1

Sample Output

3
153
2131

HINT

Source