Challenges
Problem Statement
All numbers in NumberLand are standing in a circle for a dancing ceremony. Every number needs a dancing partner. Dancing partner of any number is the number which is standing radially opposite to it in the circle. The numbers are from 0 to N-1. A certain number X wants to know who will be its dancing partner. Please help X.
Input
Two positive integers denoting the value of N and X.
Output
Print the number radially opposite to X in a circle of N numbers.
Constraints
4 ≤ N ≤ 20
0 ≤ X < N
Sample Input
8 2
Sample Output
6
Dcoded By: Mrudul Sankhere
Solved By: 2936
Maximum Marks: 6