SENTINEL = 999
FREEZE_THRESH = 32

numFreezing = 0
sumFreezing = 0
numTemps = 0

temp = get first temp
while temp != SENTINEL
  numTemps++
  if temp < FREEZE_THRESH
     sumFreezing += temp
	 numFreezing++
  temp = get the next temp

# print stats
if numTemps = 0
  print no temperatures entered
else if numFreeing = 0
  print no freezing
else
  print sumFreezing / numFreezing