A patient in an ICU is on central venous line for the past one week. He is on ceftazidime and amikacin. After 7 days of antibiotics he develops a spike of fever and his blood culture is positive for gram positive cocci arranged in pairs, which are catalase negative. Following this vancomycin was staed but the culture remained positive for the same organism even after 10 days of therapy. The most likely organism causing this infection is-: