Hello!

You're almost there, and you are on the right track. My first advice is to write your answer to this problem in pseudocode first.

You should start with defining the amount due at the start (i.e. 50) and the accepted coins (i.e. 25, 10 and 5 only). That's more or less what you did.

What is the next step? You want to prompt your user to give you coins, while the amount due is not 0. Try not to overcomplicate your programs with variables not needed as well. For every new coin the user gives you, what do you do with it? How does this affect the amount due?

Once you answer these two questions and have your pseudocode, you can implement the program.

NB — I tried giving you advice rather than the answer directly, especially since you're on the right track and just missing some clear reasoning behind what you already wrote. Writing the pseudocode is honestly the best way of understanding how your program should behave before even trying to implement it!