Description: Write a program to simulate a vending machine.
You can put coins in the vending machine to buy merchandise. The list of goods from the vending machine user to select a commodity and investment coins. If the amount is enough, will provide the corresponding goods If the amount is not enough, or if the merchandise has been sold out, it will return the coins. Maintenance of vending machines to add staff can take away sales of goods or money
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means3.txt
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