CloudLabs My First Calculator

In this simulation, you are tasked with building a calculator that can perform basic operations such as addition and subtraction. To prove that the calculator works correctly, you must participate as a jury in a marbles tournament by qualifying the participants. To do so, at the end of each encounter with the participants, you must choose, through mathematical operations, who is the winner and determine how many marbles each one will end up with. If your calculator isn't working properly, you must adjust it so that it performs the operations correctly.