List<List<double>> L123 = new List<List<double>> { new List<double>(), new List<double>(), new List<double>() };
            new List<double>() { 1, 1, 2, 3, 5, 7, 9 }
               .OrderByDescending(a => a)
               .ToList()
               .ForEach(b =>
               {
                   L123
                  .ElementAt(L123
                            .Select((e, i) => new { e, i })
                            .Aggregate((f, s) => f.e.Sum() < s.e.Sum() ? f : s)
                            .i)
                  .Add(b);
               });