12
0         	15 14 14
1        	15  9 12 
3        	15 12 11
4        	 9  9 13
6        	12 15 15
7        	15  8  9
10        	 0  0  3
11        	15 15  0
12        	15  0  0
13        	 8  0  0
14        	15  8  9
15        	 0  0  0