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现有如下购物场景：某商店矿泉水单价为2元，面包单价为4元。一位顾客购买了3瓶矿泉水和2个面包，支付了20元，需要通过代码模拟计算收银员应找零的金额。
water = 2 bread = 4 count_water = 3 count_bread = 2 pay = 20 total = water * count_water + bread * count_bread change = pay - total print(change)
water = 2 bread = 4 count_water = 3 count_bread = 2 pay = 20 total = water + count_water + bread + count_bread change = pay - total print(change)
water = 2 bread = 4 count_water = 3 count_bread = 2 pay = 20 total = water * count_water + bread * count_bread change = total - pay print(change)
water = 2 bread = 4 count_water = 3 count_bread = 2 pay = 20 total = water * count_water * bread * count_bread change = pay - total print(change)