#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define F first
#define S second
signed main(){
    int n , d;
    cin >> n >> d;
    vector<int> a(n);
    for(auto &i : a) cin >> i;
    auto b = a;
    sort(b.begin(), b.end());
    int ans = 0;
    for(int it : b){
    	int l = it - 1;
    	int r = l + d;
    	auto v = a;
    	for(auto &i : v){
    		if(i < l) i = l;
    		else if(i > r) i = r;
		}
		int sum = 0;
		for(int i = 1; i < n; i++){
			sum += abs(v[i] - v[i - 1]);
		}
        ans = max(ans, sum);
	}
	
	cout << ans << '\n';
    
}