Answer:
4
Explanation:
Lay out your numbers from least to greatest.
0,0,0,1,2,3,4,4,5,5,6,7,9
Then eliminate the same quantity of numbers from left and right
0,0,1,2,3,4,4,5,5,6,7
0,1,2,3,4,4,5,5,6,
1,2,3,4,4,5,5,6
2,3,4,4,5
3,4,4
4
Your answer would be 4