Peppino buys some groceries for Martino and Marti' is none too happy with the bill. He goes over what Peppino bought, giving the quantity as due and du' [short for due (two)] for the canned tomatoes, beer etc. Often, this due isn't a literal two, but means a small amount. You frequently hear the du' at fruit and vegetable shops or markets, where customers might ask for just a little bit of something, such as "du' ciliegie" [cherries]. The du' is also a polite way of preventing the vendor from heaping produce on the scale.