Puzzle, over which puzzled 500,000 people

It's time to stretch your brain! Can you solve this complex puzzle over the answer to which for a long time unsuccessfully fighting thousands of people?

The website advises the reader to be very careful and focused in order to find the right solution to a new puzzle!





Before you mathematical examples, where instead of numbers used horseshoes, horses and boots. Try to find a pattern to the already known answers and give me a number that is a solution for the last example.

Tips



Pay attention to the order of arithmetic operations. Don't confuse the multiplication sign and a plus sign in the last example. Trust your eyes: in the last example only one Shoe and only one Shoe. Response



21.

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