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RGB7104 - 4 тооны бага

Өгөгдсөн 4 тооны багыг ол.

Input

Нэг мөрөнд Int төрлийн 4 тоо зайгаар тусгаарлагдан өгөгдөнө.

Output

Бага тоо.

Example

Input:
3 2 1  4
Output:
1
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Added by:Bataa
Date:2011-05-23
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:NCSHARP C++ 4.3.2 CPP CPP14 JULIA PYPY3
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