A Strange Calculator

Algebra Level 1

I have a strange calculator. The four elementary calculations \(+ , - , \times, \div\) are not available, but there is a button (called OMG) which has the following property: if you enter the number \(a,\) press OMG, and enter the number \(b,\) then the result shown on the screen is \(1-\frac{a}{b}\). The change signs button and the calculator's memory are functioning normally, as are all the numbers from 0 to 9.

Is it possible to calculate the expression \(\frac{(2018+2019-2020)\times 2021}{2022}\) using the calculator only?

EDIT: You MUST only use the calculator to calculate the expression! (i.e. you must perform the calculation \(2018+2019\), then subtract the answer by \(2020\), etc., using only buttons on the calculator). You CANNOT simplify the expression beforehand!

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