Group by constant

public Tuple<long, long> GetDriveSizeAndCountPerOrganization(int organizationId, bool fromTeams, List<UserBackup> userBackups)
        {
            if (userBackups != null && userBackups.Count > 0)
            {
                var sums = userBackups
                .Where(x => x.User.OrganizationId == organizationId && x.ServiceType == (int)ServiceTypeEnum.Drive)
                .GroupBy(x => true)
                .Select(x => new
                {
                    TotalSize = fromTeams ? x.Sum(x => x.TotalSizeOnStorageTeams) / 1000 : x.Sum(x => x.TotalSizeOnStorage) / 1000,
                    NumberOfItems = fromTeams ? x.Sum(x => x.TotalItemCountTeams) : x.Sum(x => x.TotalItemCount)
                })
                .First();

                if (sums == null) return new Tuple<long, long>(0, 0);
                else return new Tuple<long, long>(sums.TotalSize, sums.NumberOfItems);
            }
            else
            {
                return new Tuple<long, long>(0, 0);
            }
        }