Eulerian and Hamiltonian Graphs · Easy problem

A "barbell" graph has two squares, $1\text{-}2\text{-}3\text{-}4\text{-}1$ and $5\text{-}6\text{-}7\text{-}8\text{-}5$, joined by TWO separate bridge edges both between $1$ and $5$ (so $15$ is a doubled edge, $10$ edges total). How many vertices of this multigraph have odd degree?