//imie nazwisko stanowisko i nazwe firmy tych ktorzy zarabiajawiecej niz 3k
            var res = (from e in emps
                       join j in jobs on e.JobId equals j.Id
                       join c in comps on j.CompanyId equals c.Id
                       where j.Salary > 3000
                       select new { e.Name, e.Surname, Position = j.Name, Company = c.Name }).Take(1);

            foreach (var v in res)
            {
                Console.WriteLine(v);
            }