MISSING NUMBER#7822
In the express lottery draw, tickets were printed, each uniquely numbered from to . However, when the winning number was drawn, it was discovered that the ticket with that number was missing. Given the total number of tickets and the list of all available numbers, identify the missing number.
The first line contains a non-negative integer , where 1 \leq N \leq 10^6. The second line lists N-1 distinct natural numbers, each not exceeding .
The missing number.
Example 1