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Question Number 125580 by Mammadli last updated on 12/Dec/20
$$\boldsymbol{{One}}\:\boldsymbol{{number}}\:\boldsymbol{{is}}\:\boldsymbol{{written}}\:\boldsymbol{{on}}\:\boldsymbol{{the}}\:\boldsymbol{{board}}. \\ $$$$\boldsymbol{{Each}}\:\boldsymbol{{time}}\:\boldsymbol{{the}}\:\boldsymbol{{number}}\:\boldsymbol{{is}}\:\boldsymbol{{either}}\:\boldsymbol{{squared}}\:\boldsymbol{{or}}\:\boldsymbol{{multiplied}}\:\boldsymbol{{bh}}\:\mathrm{2}. \\ $$$$\boldsymbol{{If}}\:\mathrm{1}\:\boldsymbol{{is}}\:\boldsymbol{{written}}\:\boldsymbol{{on}}\:\boldsymbol{{the}}\:\boldsymbol{{board}}\:\boldsymbol{{at}}\:\boldsymbol{{the}}\:\boldsymbol{{beginning}}, \\ $$$$\boldsymbol{{it}}\:\boldsymbol{{is}}\:\boldsymbol{{necessary}}\:\boldsymbol{{to}}\:\boldsymbol{{perform}}\:\boldsymbol{{at}}\:\boldsymbol{{least}} \\ $$$$\boldsymbol{{several}}\:\boldsymbol{{operations}}\:\boldsymbol{{to}}\:\boldsymbol{{get}}\:\boldsymbol{{the}}\:\boldsymbol{{number}}\:\mathrm{2}^{\mathrm{2018}} . \\ $$