Merging verts from 2 different obj files

i was wondering if someone could help me out with this. i made a basic body mesh and in a new file i made a foot. the foot has like 24 verts where id like to attach it to the legs that has around 18 verts. how do i go about attaching them without screwing anything up?

Either Shift+Alt+Right click to select and Delete some Edge Loops on one mesh, or add needed on another by Crtl-R.