items:=T(T("apple",     39, 40),T("banana",   27,60), // item: (name,weight,value)
        T("beer",       52, 10),T("book",     30,10),T("camera",      32, 30),
	T("cheese",     23, 30),T("compass",  13,35),T("glucose",     15, 60),
	T("map",         9,150),T("note-case",22,80),T("sandwich",    50,160),
	T("socks",       4, 50),T("sunglasses",7,20),T("suntan cream",11, 70),
	T("t-shirt",    24, 15),T("tin",      68,45),T("towel",       18, 12),
	T("trousers",   48, 10),T("umbrella", 73,40),T("water",      153,200),
	T("overclothes",43, 75),T("waterproof trousers",42,70) );
const MAX_WEIGHT=400;
knapsack:=items.reduce(addItem,
   (MAX_WEIGHT).pump(List,T(0,T).copy))[-1];  // nearest to max weight
weight:=items.apply('wrap(it){ knapsack[1].holds(it[0]) and it[1] }).sum(0);
knapsack.println(weight);