Medical residents at Lakewood Hospital are choosing their individual specialties. Among them, 40% choose cardiology, 16% choose oncology, 34% choose endocrinology, and the remaining x% choose hematology. Once the doctors pick their first speciality , they are then each asked to choose a second specialty from the previous four options in case their original speciality is already filled. They may not pick their original speicality again. 20% of those who originally picked cardiology choose oncology as their second choice. IF no other field choose oncology as their second choice, and the hospitals boasts 200 medical residents, then what is the total number of residents who named oncology as either their first or second choice, in terms of x?