5 8
0 4
0 1 1
1 4 2
0 2 1
2 4 2
0 3 4
3 4 1
1 3 10
2 3 10
6 7
5 0
5 1 2
1 0 2
5 2 2
2 0 2
5 3 5
3 4 1
4 0 1
0 0