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RGB7106 - Үржвэр 5

Өгөгдсөн 4 тооны 5-аас бага тоонуудын үржвэрийг ол. 5-аас бага тоо ядаж 1 байгаа.

Input

Нэг мөрөнд Int төрлийн 4 тоо зайгаар тусгаарлагдан өгөгдөнө.

Output

Үржвэр

Example

Input:
3 6 2 4

Output:
24

Added by:Bataa
Date:2011-05-24
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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