11771177 SUSTech Online Judge
Problem 1177 --Spanning Tree 1.0

1177: Spanning Tree 1.0

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 798  Solved: 258
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Description


Input

Output

Sample Input

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

Sample Output

5

HINT

Source

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