[Test1]
input=3,9,20,NULL,NULL,15,7
output=2
[Test2]
input=4,3,1,2,NULL,6,8
output=3
[Test3]
input=4,3,1,NULL,2,6,8
output=3
[Test5]
input=NULL
output=1
[Test6]
input=
output=0
[Test7]
input=1,0,0,2,NULL,NULL,0
output=3
[Test8]
input=1,3,5,7,9,2,4,6,8,10,12,14,16,18,10,NULL,NULL,NULL,NULL,22
output=4
[Test9]
input=1,3,5,7,9,NULL,NULL,2,NULL,4,NULL
output=2
[Test10]
input=1,3,NULL,5,7
output=3
[Test11]
input=23,21,22,NULL,1,2,NULL
output=3
[Test12]
input=2,NULL,3
output=2