Write a program that reads sequences
with all the numbers between 1 and *n* but one,
and tells which one is missing.

**Input**

Input consists of several sequences.
Every sequence begins with a number *n* between 1 and 10^{4}
followed by *n* − 1 natural numbers.
Every number between 1 and *n* appears exactly once,
except one of them, which is missing.

**Output**

For every sequence, print the missing number.

Public test cases

**Input**

5 3 2 1 5 2 1 10 5 4 6 7 1 2 9 10 8

**Output**

4 2 3

Information

- Author
- Jordi Petit
- Language
- English
- Translator
- Carlos Molina
- Original language
- Catalan
- Other languages
- Catalan
- Official solutions
- C++ Java Python
- User solutions
- C C++ Java Python