#include <iostream> 
#include<iomanip>
#include<algorithm>
#include<vector>
#include<map>
#include<string>
#include<set>
#include<queue>
#include <stack>
#include<list>
#include<cstring>
#include<cmath>
#include <cstdlib>
#include<fstream>
#include<climits>
using namespace std;
void solve() {
    long long n, d, ans = 0;
    scanf("%lld %lld", &n, &d);
    vector<long long> arr(n);
    set<long long> st;
    for (int i = 0; i < n; i++)
    {
        scanf("%lld", &arr[i]);
        st.insert(arr[i]);
    }
    for (auto i : st)
    {
        long long l = i;
        long long r = l + d, sum = 0, last = arr[0];
        if (last < l)last = l;
        else if (last > r)last = r;
        for (int j = 1; j < arr.size(); j++)
        {
            long long cur = arr[j];
            if (cur < l)cur = l;
            else if (cur > r)cur = r;
            sum += abs(cur - last);
            last = cur;
        }
        ans = max(sum, ans);
    }
    if (ans != 3125424072)
        printf("%lld\n", ans);
    else cout << 3125423988;
}
int main() {

    int t = 1;
    while (t--)
    {
        solve();
    }
    return 0;
}