12
0         	15 14 15
1        	 8 10 12
3        	15 12 11
4        	 9  9 13
6        	12 15 15
7        	 4  4  8
10        	 0  0  3
11        	15 15  0
12        	 0  0  5
13        	 0  0  2
14        	 4  4  8
15        	 0  0  0