At 12:00 P. M., the water pressure on a submarine is $435 pounds per square inch. From 12:00 P. M. to 12:30 P. M., the water pressure increases $58 pounds per square inch. From 12:30 P. M. to 1:00 P. M., the water pressure decreases $116 pounds per square inch. What is the water pressure at 1:00 P. M.?

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