Given an unsorted array of elements, it is missing exactly one element from the sequence of to . Find the missing element.

Input Format

An integer followed by space separated numeric values.

Constraints

Output Format

The missing value.

Sample Input 0

10
10 7 4 3 5 1 9 6 8

Sample Output 0

2

Explanation 0

The missing element is 2.

Sample Input 1

6
5 3 4 1 2

Sample Output 1

6

Explanation 1

The last element is missing

Line: 1 Col: 1
  1. Challenge Walkthrough
    Let's walk through this sample challenge and explore the features of the code editor.1 of 6
  2. Review the problem statement
    Each challenge has a problem statement that includes sample inputs and outputs. Some challenges include additional information to help you out.2 of 6
  3. Choose a language
    Select the language you wish to use to solve this challenge.3 of 6
  4. Enter your code
    Code your solution in our custom editor or code in your own environment and upload your solution as a file.4 of 6
  5. Test your code
    You can compile your code and test it for errors and accuracy before submitting.5 of 6
  6. Submit to see results
    When you're ready, submit your solution! Remember, you can go back and refine your code anytime.6 of 6
  1. Check your score