Hidden in the heart of Russia, there is a Soviet-era city where thousands of people live and work behind barbed-wire fences monitored by armed guards. It is Ozyorsk (Ozersk), located in the Chelyabinsk Oblast, one of the most polluted places on the planet and home to the largest stockpiles of nuclear material. Its code name: City 40.
Please solve the math problem below to unlock download mirrors for City 40.
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