Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
Which part of the code box (the code, Run, Reset, Copy, the Input box or the output) do you use to: (a) start the program, (b) go back to the first version of the code, (c) give answers to input(), (d) see what the program shows?
Run starts the program. Reset goes back. The Input box holds answers. The output shows the result.
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
Copy is the fifth button. It copies the code, so you can use it somewhere else.
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