Problem:
Score : 300 points

Problem Statement

Given any integer x, Aoki can do the operation below.

Operation: Replace x with the absolute difference of x and K.

You are given the initial value of an integer N. Find the minimum possible value taken by N after Aoki does the operation zero or more times.

Constraints

0 ≤ N ≤ 10^{18}

1 ≤ K ≤ 10^{18}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N K

Output

Print the minimum possible value taken by N after Aoki does the operation zero or more times.

Sample Input 1

7 4

Sample Output 1

1

Initially, N=7.

After one operation, N becomes |7-4| = 3.

After two operations, N becomes |3-4| = 1, which is the minimum value taken by N.

Sample Input 2

2 6

Sample Output 2

2

N=2 after zero operations is the minimum.

Sample Input 3

1000000000000000000 1

Sample Output 3

0

Solution in Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.Scanner;
 
public class Main{
 
	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		
		Scanner sc=new Scanner(System.in);
		
		long N_absolute=Math.abs(sc.nextLong());
		long K_absolute=Math.abs(sc.nextLong());
		long result=N_absolute;
		long hiki=0;

		result=N_absolute%K_absolute;
	
		if(result==0) {
			System.out.println(result);
		}else {
			hiki=result-K_absolute;
			hiki=Math.abs(hiki);
			if(result>hiki) {
				System.out.println(hiki);
			}else {
				System.out.println(result);
			}
		}
	
	}
}