Which is missing?

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.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-01-25T12:21:46.163Z