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Input the right mathematical formula!
It is easy calculation.
Both children and adults can enjoy themselves.

It is a game which inputs expression like the calculator so that it may become a numerical value displayed on the upper right.

There is the level 5 (four operations) from the level 1 (addition).

The following problem is displayed shortly after answering correctly.
It does not advance to the next in case of a mistake.

Please answer 20 questions as soon as possible.