How many airplanes and types of airplanes are in the US president's fleet?

Currently Obama has two modified 747s which are called Air Force One. It is also called VC-25.

The President in the 1960s like Kennedy used SAM 26000 also a 747

Nixon used SAM 27000 also a 747

He also has Marine One which is a helicopter but he has two kinds:

VH-3D Sea King

VH-60N White Hawk

Although many earlier Presidents used different types of helicopters.