getCoreUpgradeCost() Netscript Function
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.. js:function:: getCoreUpgradeCost(i, n)

    :RAM cost: 0 GB
    :param number i: Index of Hacknet Node. :ref:`See here for details <netscript_hacknetnodeapi_referencingahacknetnode>`
    :param number n: Number of times to upgrade cores. Must be positive. Rounded to nearest integer
    :returns: Cost of upgrading the number of cores of the specified Hacknet Node by ``n``.

    If an invalid value for ``n`` is provided, then this function returns ``0``. If the
    specified Hacknet Node is already at the max number of cores, then ``Infinity`` is returned.