// Kotaro << Minoz << Hayama << Cohr3141592654

// Fall...

// You know, everybody's been tellin' me what they think about me for the last few months

// ... It's too loud
// Maybe it's time I tell 'em what I think about them
// ... Can't hear it coming down the hallway stairs from the parking lot
// ... It's too loud
// ... Three's not a crowd all up in it, slow fire

// ... Don't fall on my face
// ... Don't fall on my faith, oh
// ... Don't fall on my fate
// ... Don't fall on my faith, oh
// ... Don't fall on my fate
// ... Don't fall on my

// Gotta concentrate, against the clock I race
// Got no time to waste, I'm already late, I got a marathoner's pace
// Went from addict to a workaholic, word to Dr. Dre
// In that first marijuana tape-guess I got a chronic case (yeah)
// And I ain't just blowin' smoke, 'less it's in your momma's face

// I know this time Paul and Dre
// They won't tell me what not to say (nope)

// And though me and my party days
// Have all pretty much parted ways

// You'd swear to God I forgot I'm the guy that made "Not Afraid"
// One last time for Charlamagne
// If my response is late, it's just how long it takes
// To hit my fuckin' radar, I'm so far away

// These rappers are like Hunger Games
// One minute, they're mockin' Jay
// Next minute, they get their style from Migos or they copy Drake
// Maybe I just don't know when to turn around and walk away
// But all the hate, I call it "Walk on Water" gate
// I've had as much as I can tolerate
// I'm sick and tired of waitin', I done lost my patience
// I can take all of you motherfuckers on at once
// You wanted Shady? You got him!

// ... Don't fall on my face (yeah)
// ... Don't fall on my faith, oh
// ... Don't fall on my fate (line 'em up!)
// ... Don't fall on my faith, oh (rrr!)
// ... Don't fall on my fate (look)

// Somebody tell Budden before I snap, he better fasten it
// Or have his body bag get zipped
// The closest thing he's had to hits is smackin' bitches
// And don't make me have to give it back to Akademiks
// Say this shit is trash again, I'll have you twisted
// Like you had it when you thought you had me slippin' at the telly
// Even when I'm gettin' brain, you'll never catch me with a thot
// Lackin' with it, "he ain't spittin' like this on his last shit"
// Ho, you better go back and listen
// You know me better, thinkin' I'll slow or let up
// Call it trap 'cause it's a total setup
// Hopin' that you rappers fall in that
// Dre said, "Hold your head up!"—Kathy Griffin
// Stackin' ammunition, slap the clip in, cock it back on competition
// This is how I shot ahead (pew)—Gabby Giffords
// My attack is vicious, Jack the Ripper, back in business
// Tyler create nothin', I see why you called yourself a (faggot), bitch
// It's not just 'cause you lack attention
// It's because you worship D12's balls, you're sack-religious
// If you're gonna critique me
// You better at least be as good or better
// Get Earl the Hooded Sweater
// Whatever his name is to help you put together
// Some words, more than just two letters
// The fans waited for this moment like that feature
// When I stole the show (ha), sorry if I took forever (haha)

// ... Don't fall on my face (yeah)
// ... Don't fall on my faith, oh (I won't)
// ... Don't fall on my fate (line 'em up!)
// ... Don't fall on my faith, oh (ha)
// ... Don't fall on my fate (it's too easy)

// Just remember, I was here before you
// And I'll be here after you make your run-in for you
// Detractors, I might have to fuck Pitchfork with a corkscrew
// Just what the doctor ordered
// Revenge is the best medicine
// Increase the dose, from least to most
// And then tell the Grammys to go and fuck themselves
// They suck the blood from all the biggest artists like some leeches
// So they nominate 'em, get 'em there, get a name to MC the show
// Every parasite needs a host (haha)
// Then give Album of the Year to somebody that no one's ever even heard of
// All I know is I wrote every single word of
// Everything I ever murdered
// Time to separate the sheep from goats (yeah)
// And I got no faith in your writers, I don't believe in ghosts
// When rap needed it most, I was that wing and a prayer
// A beacon of hope, put a B-I-R-D in the air
// Somewhere some kid is bumpin' this while he lip-syncs in the mirror
// That's who I'm doin' it for, the rest I don't really even care
// But you would think I'm carryin' a Oxford dictionary in my pocket
// How I'm buryin' these artists
// On a scale of 'turnt' you're 'minus'
// Mine says 'very', yours says 'hardly'
// And what's scary is you probably can compare me to your car 'cause I'm just barely gettin' started (woo)
// And far as Lord Jamar, you better leave me the hell alone
// Or I'll show you an Elvis clone
// Walk up in this house you own, thrust my pelvic bone
// Use your telephone and go fetch me the remote
// Put my feet up and just make myself at home
// I belong here, clown, don't tell me 'bout the culture
// I inspired the Hopsins, the Logics, the Coles, the
// Seans, the K-Dots, the 5'9"s, and oh
// Brought the world 50 Cent, you did squat, piss and moan
// But I'm not gonna fall... bitch!

// ... It's too loud
// ... Can't hear it coming down the hallway stairs from the parking lot
// ... It's too loud
// ... Three's not a crowd all up in it
// ... Slow fire


#pragma GCC optimize ("Ofast,unroll-loops")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
 
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
 
#define pb push_back
#define ff  first
#define ss second
#define tm1 first
#define tm2 second.first
#define tm3 second.second
#define sz(x) int(x.size())
#define fill(x, v) memset(x, v, sizeof(x))
#define all(v) (v).begin(), (v).end()
#define FER(i,a,b) for(ll i=ll(a); i< ll(b); ++i)
#define IFR(i,a,b) for(ll i=ll(a); i>=ll(b); --i )
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
 
#define N 200005
#define mod 998244353
#define N1 5
#define sqr(x) (x)*(x)
#define INF 1000000000000000000

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef pair<ll, ll> ii;
typedef pair<ll, ii > tri;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> set_t;
 
#define trace(...) f(#__VA_ARGS__, __VA_ARGS__)
 
template<typename t> void f(const char* x, t&& val1){
    cout<<x<< " : "<<val1<<endl;
}
template<typename t1, typename... t2> void f(const char* x, t1&& val1, t2&&... val2){
    const char* xd=strchr(x+1, ',');
    cout.write(x, xd-x)<<" : "<<val1<<" | ";
    f(xd+1, val2...);
}


ll dp[N], ar[N];

int main(){
    fastio;
    fill(dp, 0), fill(ar, 0);
    ll n, k; cin>>n>>k;
    FER(i,0,n) cin>>ar[i];
    FER(i,1,n){
    	ll ans=INF;
    	FER(j,1,k+1){
    		i-j>=0? ans=min(ans, dp[i-j]+abs(ar[i]-ar[i-j])): ans=ans;
    	}
        dp[i]=ans;
    }
    cout<<dp[n-1]<<endl;
    // trace(dp[n-1]);
    return 0;
}

Measured memory_bytes: 3328