Task
Time limit: 1000 ms,
Memory limit: 256 Mb

By integer natural  \(N\) calculate \(N!\) – multiplication of all natural numbers from 1 to N (\( N!=1 \cdot 2 \cdot 3 \cdot …\cdot N\) ).

Input
Integer 1<=N<=12.
Ouput
print \(N!\)

Examples
Input Output
1 5 120

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