#include <bits/stdc++.h>

#define N 5100
#define ll long long
using namespace std;

ll n, d, a[N], b[N], c[N];
ll sum, ans;
int main() {
    cin>>n>>d;
    for(ll i = 1;i <= n; i++) cin>>a[i], b[i] = a[i];
    sort(b + 1, b + n + 1);
    for(ll i = 1; i <= n; i++) {
        ll low = i, hig = i, l = i, r = n;
        sum = 0;
        while (l <= r)  {
            ll mid = (l + r) / 2;
            if(b[mid] - b[low] <= d) hig = mid, l = mid + 1;
            else r = mid - 1;
        }
        for(ll i = 1; i <= n; i++) {
            c[i] = max(a[i], b[low]);
            c[i] = min(c[i], b[hig]);
            sum += abs(c[i] - c[i - 1]);
        }
        ans = max(ans, sum - abs(c[1]));
    }
    cout<<ans<<endl;
}