Restorer Distance

medium
Question Solve Solutions 
<a href="https://codeforces.com/contest/1355/problem/E" target="_blank"><i class="fa fa-external-link" aria-hidden="true"> Link -> Restorer Distance</i></a>

Input Format

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Output Format

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Constraints

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Example

Input
3 1 100 100
1 3 8
Output
12
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