4713: P8687 [蓝桥杯 2019 省 A] 糖果
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description

Input

Output

Sample Input Copy
6 5 3
1 1 2
1 2 3
1 1 3
2 3 5
5 4 2
5 1 2
Sample Output Copy
2
HINT
