def main():
    total_coins = 0
    while total_coins < 50:
        print(f"Amount Due: {50 - total_coins}")
        new_coin = input("Insert coin:\t\t")
        if new_coin not in ('5', '10', '25'):
            new_coin = 0
        else:
            new_coin = int(new_coin)
        total_coins += new_coin
    print(f"Change Owed: {total_coins - 50}")


if __name__ == "__main__":
    main()