#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define all(v) v.begin(), v.end()
#define logg(x) (31 - __builtin_clz(x))
#define llogg(x) (63 - __builtin_clzll(x))
#define mini(v) min_element(v.begin(), v.end())
#define maxi(v) max_element(v.begin(), v.end())
#define TIME cerr << double(clock() - st) / (double)CLOCKS_PER_SEC
#define sq(a) ((a)*(a))
#ifdef hocln
#include "deb.h"
#else
#define imie(...) ""
#define debug() cerr
#endif
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef long double ld;
typedef tuple<ll, ll, ll> triple;
typedef tuple<ll, ll, ll, ll, ll> five;
typedef unsigned long long ull;
const long long INF = 4e18;
const int inf = 2e9;
const int MN = 3e5 + 15;
const int MX = 2e6 + 15;
const long long MOD = 1e9 + 7;
//const long long MOD = 998244353;
const long double PI = 3.141592653589793238462643383279502884197;
template<typename T, typename T2> bool chmax(T& a, const T2& b) { return a < b ? a = b, 1 : 0; }
template<typename T, typename T2> bool chmin(T& a, const T2& b) { return a > b ? a = b, 1 : 0; }
template<typename T> using vector2 = vector<vector<T>>;
const int dx[] = { 0, 1, 0, -1, 1, 1, -1, -1 };
const int dy[] = { 1, 0, -1, 0 , 1, -1, 1, -1};
std::random_device rd;
std::mt19937 gen(rd());
ll random(ll low, ll high) { uniform_int_distribution<> dist(low, high); return dist(gen); }
template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p) {
    is >> p.first;
    return is >> p.second;
}
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v) {
    for (auto &i: v) os << i << ' ';
    return os;
}
int tc = 0;

inline ll calc(vector<ll>v, ll l, ll r) {
	for(auto& i : v) {
		if(i > r) i = r;
		else if(i < l) i = l;
	}
	ll ans =0;
	for(int i = 1;i < (int)v.size();i++) {
		ans += abs(v[i]-v[i-1]);
	}
	return ans;
}

inline void solve_test() {
	int n, d;
	cin >> n >> d;
	vector<ll>v(n);
	for(auto& i : v) cin >> i;
	set<ll>st(all(v));
	ll ans = 0;
	for(auto& i : st) {
		chmax(ans, calc(v,i,i+d));
	}
	cout << ans;
}

int main()
{
    //srand(chrono::steady_clock::now().time_since_epoch().count());
    //freopen("bphoto.in", "r", stdin);
    //freopen("bphoto.out", "w", stdout);
	//cout << "Case #" << tc << ": " << ans << '\n';
	//cout << fixed << setprecision(10);
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int tt = 1;
    //cin >> tt;
    while(tt--) {
		++tc;
        solve_test();
    }
}