I know that the answer to the question "How many were lost in wars, famines, and disasters?" is in "The first half of the 20th century in Russia and the Soviet Union was marked by a succession of wars, famines and other disasters, each accompanied by large-scale population losses. Stephen J. Lee estimates that, by the end of World War II in 1945, the Russian population was about 90 million fewer than it could have been otherwise.". Can you tell me what it is?
A:
90 million