def new_input():
    total = []
    while True:
        unit=input('请输入（q退出）：')
        if unit=='q':
            break
        else:
            try:
                unit = int(unit)
            except:
                print("请重新输入一个数字")
            else:
                total.append(unit)
            finally:
                print("======================") 
    return total
def sum(money):
    count = 0
    for i in money:
        count=count+i
    return count
price=new_input()
pay=sum(price)
print("您一共消费了"+str(pay)+"元！扫码还是现金呢？")