coffee.py

coffee = 3
while True:
    coin = int(input("insert coin:"))
    if coin == 300:
         print("here's coffee")
         coffee = coffee - 1
         print("coffee in %s" % coffee)
    elif coin > 300:
        print("here's coffee")
        print("change is %s coin" % (coin - 300))
        coffee = coffee - 1
        print("coffee in %s" % coffee)
    elif coin < 300:
        print("coin is not enough")
    if coffee == 0:
        print("coffee is end")
        break