1 2 5 10 ---- _ _ _ __ total = 0 _ _ 5 10 ---- 1 2 _ __ total = 2 1 _ 5 10 ---- _ 2 _ __ total = 3 1 _ _ __ ---- _ 2 5 10 total = 13 1 2 _ __ ---- _ _ 5 10 total = 15 _ _ _ __ ---- 1 2 5 10 total = 17.