Anybody can learn to count fast if he knows the secret of following trick. Ask your friend to write any five-figure   number on the blackboard. Then you write your five-figure number under it. You choose your figures so that each one with the figure above it will  make nine. Tell your friend to put a third five-figure number under your number. Then you write a fourth number in the same way. After he has written the fifth number, you draw a line under it and quickly write the sum. . You may even write it from left to right.. How do you do it ? You take away two from the fifth number and put two in front of your answer. Is it interesting? If the fifth number is 49834, the sum will be  _  .
249834 298344 298342 249832