Q: Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.
Passage: During the divestment from South Africa movement in the late 1980s, student activists erected a symbolic 'shantytown' on Harvard Yard and blockaded a speech given by South African Vice Consul Duke Kent-Brown. The Harvard Management Company repeatedly refused to divest, stating that 'operating expenses must not be subject to financially unrealistic strictures or carping by the unsophisticated or by special interest groups.' However, the university did eventually reduce its South African holdings by $230 million (out of $400 million) in response to the pressure. Question: By how much did Harvard management reduce its South Africa holdings in response to pressure?
A:
$230 million