Description

Input

Output

Sample Input

6
3 1 2 3
3 4 5 6
3 7 10 13
3 8 11 14
3 9 12 15
3 0 16 17

Sample Output

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

Source/Category