Circle Of Monsters

easy
Question Solve Solutions 
<a href="https://codeforces.com/problemset/problem/1334/C" target="_blank"><i class="fa fa-external-link" aria-hidden="true"> Link -> Circle of Monsters</i></a>

Input Format

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Output Format

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Constraints

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Example

Input
1
3
7 15
2 14
5 3
Output
6
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