Puzzle: Send More Money

A young man who is backpacking overseas sends his father the following telegram from Timbuktu:

  SEND
+ MORE
------
 MONEY

The father looked at the telegram and, with a bit of logic, he figured out the exact amount of money that his son needed! How much money did the son request? Each letter in MONEY represents a different digit.

Give your answer here. The correct answer will be displayed after you submitted your entry.

Here is the explanation on how to solve this puzzle.