How many Nobel prize winners have won the Man Booker prize?

Four Nobel Laureates (a-Sir William Geral Golding,b-Madam Nadine Gardimer,c-Vidiadhar Surajprasad Naipaul & d-John Maxwell Coetzee) have won Booker Prize in 1980,1974,1971 & 1983 as well as 1999.