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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def level_to_nside(level):
 """ Find the pixel dimensions of the top-level HEALPix tiles. This is given by ``nside = 2**level``. Parameters level : int The resolution level Returns ------- nside : int The number of pixels on the side of one of the 12 'top-level' HEALPix tiles. """

    level = np.asarray(level, dtype=np.int64)

    _validate_level(level)
    return 2 ** level