from django.db.models import Max, Sum
queryset = queryset.values('period', 'cell').annotate(x=Max('total'))
result = queryset.values(period).annotate(result=Sum('x'))

period   cell   total

1         2       40
1         2       41
2         3       23
1         4       44

queryset = queryset.values('period', 'cell').annotate(x=Max('total'))

period   cell     x
1         2       41
2         3       23
1         4       44

period   result
1          85
2          23