• 2404 Too lazy to write the description

    Time Limit : 2000/1000 MS(Java/Others) | Memory Limit : 65536/32768 KB(Java/Others)

    Submits : 106 | Solved : 52

    Description



    Input

    An integer N(0< N<=18).

    Output

    An integer.

    Sample Input

    2

    Sample Output

    20

    HINT


    Source


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