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Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 4368    Accepted Submission(s): 1276


Problem Description
 

Sample Input
4
1 2
1 3
1 4
 

Sample Output
1
 

Hint

1. The only set is {2,3,4}.

2. Please use #pragma comment(linker, "/STACK:16777216")
 

Source
2013 Multi-University Training Contest 10
 

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