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50321 - Missing Number

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Volume problems

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• 50377 - kth Permutation
• 50304 - Number Pattern
• 50322 - Snake Pattern
• 50321 - Missing Number
• 50317 - Student Line Up
• 50311 - Student Line Up
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• 50841 - My grand-grand-grandfather
• 50380 - Sum of the Numbers in the ...
• 50395 - Page "Like" Averages
• 50332 - Variance of a series
• 50398 - Sum of kth Anti-diagonal

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Prepared by Halil Karimis.

Missing Number

Shqip

Mr John is a maths professor. He writes the exercises the students have to solve on the blackboard.

He writes a sequence of N different positive integers(0 < N < 1000) on the board but the students are lazy and don’t want to study, so, they usually erase one number for fun.

As this happens so often he wants you to write a program to help him with it.

Input specification
-In the first line you will get N(the number of positive integers).
-After that in the next line you will get N positive integers
-In the third line you will read N-1 positive integers. There is no number greater than 1000.

Output specification
The number that got erased.

Sample Input I
4
4 6 3 7
7 3 4
Sample Input II
13
9 8 9 7 4 2 6 1 8 4 6 2 5
9 8 9 7 4 2 6 1 8 4 6 5
Sample Output I
6
Sample Output II
2


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