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

public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		//your code here
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int k = sc.nextInt();
        int arr[] = new int[n];
        for(int i=0;i<n;i++)arr[i]=sc.nextInt();
        int ans = subarrsumk(arr,k);
        System.out.print(ans);
	}
    public static int subarrsumk(int [] arr, int target)
    {
        int n = arr.length;
        int ans = 0;
        HashMap<Integer,Integer> map = new HashMap<>();
        map.put(0,-1);  // intial sum 0 and it has a freq 1
        int sum = 0;
        for (int i=0; i<n; i++)
            {
                sum += arr[i];
                if(map.containsKey(sum - target))
                {
                    ans = Math.max(ans, i-map.get(sum - target));
                }
                if(!map.containsKey(sum))
             map.put(sum,i);
            }
        return ans;
    }
}