MathDB

Vanya was asked to write on the board an expression equal to

10

, using only the numbers

1

, the signs

+

and

-

and brackets (you cannot make up the numbers

11

111

, etc., as well as

(-1)

). He knows that the bully Anton will then correct all the

+

signs to

-

and vice versa. Help Vanya compose the required expression, which will remain equal to

10

even after Anton's actions.

Problem Statement