5
0 0
0 1
0 3
0 4
0 2
4 4
4 0
4 2
4 1
4 3
3 0
3 2
3 3
3 4
3 1
1 0
1 1
1 3
1 4
1 2
2 2
2 0
2 1
2 2
2 3
2 4
