Eight people E, H, M, P, S, T, Y and Z are sitting in a straight line. All of them are facing North.  E sits fourth from one of the extreme ends of the line. H sits third to the right of E. As many people sit to the right of H as to the left of M. Only one person sits between M and P. S sits to the immediate right of Z. Only one person sits between Z and T.

How many people sit to the left of Y?