pp2(Row, Column, Sum, Tri, M) =>
  if Sum > M.get(max_val,0) then
     M.put(max_val,Sum)
  end,
  Row := Row + 1,
  if Row <= Tri.length then
    foreach(I in 0..1)
       pp2(Row,Column+I, Sum+Tri[Row,Column+I], Tri, M)
     end
  end.