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Doing the Container Shuffle

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English

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Time limit
2000 ms
Memory limit
2048 MB (no extra memory)
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Statement

Doing the Container Shuffle, original English page 1

Doing the Container Shuffle, original English page 2

Examples

Sample input 1
5
4 2 5 3 1
Sample output 1
7.000
Sample input 2
6
1 2 3 4 5 6
Sample output 2
13.500

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