Practice on Toph

Participate in exhilarating programming contests, solve unique algorithm and data structure challenges and be a part of an awesome community.

Missing Number

Limits 1s, 512 MB

Given the sum of four numbers and three of those numbers, find the missing number.

All four numbers are positive integers.

Input

The input will contain one integer (the sum of the four numbers) in the first line and 3 integers (three of those four numbers) in the second line.

All numbers in this problem fit in 32-bit signed integers.

Output

Print the missing number.

Samples

InputOutput
10
1 2 3
4

Discussion
Submit

Login to submit