Quickly Solve the riddle

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?




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In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.