total       used       free     shared    buffers     cached
Mem:       1034332     983572      50760          0     149028     530132
-/+ buffers/cache:     304412     729920
Swap:       131064       9856     121208

Mem:             A          B          C          D          E          F
-/+ buffers/cache:          G          H

G+H = A
E+F+G = B   ## probably D+E+F+G
C+E+F = H   ## probably C+D+E+F