#include <iostream>
#include<bits/stdc++.h>
 
 
using namespace std;
 
int main() {
	// your code goes here
	int n,k;
	cin>>n>>k;
	vector<int> nums(n);
	for(int i=0;i<n;i++){
		cin>>nums[i];
	}
 
	int ans=INT_MIN;
 
	for(int i=0;i<n;i++){
		int sum=0;
		for(int j=i;j<n;j++){
			sum=sum+nums[j];
			if(abs(nums[j]-nums[i])==k){
				ans=max(ans,sum);
			}
		}
	}
	if(ans==INT_MIN){
	cout<<"Not possible"<<endl;
 
	}
	else{
		cout<<ans;
	}
 
	return 0;
}

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NCAyMAoxMCAyMCAzMCA0MA==

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