import strutils, sequtils

var 
  args=stdin.readLine.split.map(parseInt)
  (a, b)=(args[0], args[1])

if a mod 100 == 0 and b mod 100 == 0:
  if a*b==0:
    echo ""
  else:
    echo a*b div 10
else:
  if -99999999<=a*b and a*b<=99999999:
    echo a*b
  else:
    echo "E"