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Identifying effective number of atoms per unit cell. (BASIC)

Problem

A cubic unit cell has atoms present only at all the face centres.
If the atoms along any one pair of adjacent faces are removed, calculate the effective number of atoms per unit cell.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
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