void main()
{
    object oPC = GetExitingObject();
    object oKey = GetItemPossessedBy(oPC, "nk_fp_keysilver");
    if (GetIsObjectValid(oKey))
    {
        object oBrain = GetNearestObjectByTag("nk_fp_brain", OBJECT_SELF, 1);
        SetLocalInt(oBrain, "SILVER", 0);
    }
}