/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int b[]=new int[n];
		int k=sc.nextInt();
		for(int i=0;i<n;i++)
		b[i]=sc.nextInt();
		
		Map<Integer,Integer> m=new HashMap<>();
		
		int ans=Integer.MAX_VALUE;
		for(int i=0;i<n;i++)
		{
			int cpl=k-b[i];
			if(m.containsKey(cpl))
			{
				int len=i-m.get(cpl)+1;
				ans=Math.min(len,ans);
			}
			m.put(b[i],i);
		}
		
		System.out.println(ans);
		
		
		
		
		
		
	}
}