Problem 1996. -- [Hnoi2010]chorus 合唱队 -- 衡阳八中OJ离线版-2014-11-04

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Problem 1996. -- [Hnoi2010]chorus 合唱队 -- 衡阳八中OJ离线版-2014-11-04

1996: [Hnoi2010]chorus 合唱队

Time Limit: 4 Sec Memory Limit: 64 MB
Submit: 907 Solved: 569
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Description

Input

Output

Sample Input

4
1701 1702 1703 1704

Sample Output

8

HINT

Source

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