7
20

// begin data for node  1
0
2 2 3
8
15
1200
6

// begin data for node  2
1
2 4 5
7
20
600
7

// begin data for node  3
1
2 6 7
6
25
600
8

// begin data for node  4
2
0
12
20
300
0

// begin data for node  5
2
0
12
20
300
0

// begin data for node  6
3
0
10
25
300
0

// begin data for node  7
3
0
10
25
300
0