




import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.*;

public class Main {
    static int c=0;
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }



    public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    }




} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.lang.reflect.Array; Array java.lang.reflect import java.util.*; util.* java public class Main {
    static int c=0;
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }



    public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    }




} Main static int c=0; c 0 public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    } main {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    } FastReader fr = new FastReader(); fr new FastReader() int n = fr.nextInt(); n fr.nextInt() fr.nextInt fr int k=fr.nextInt(); k fr.nextInt() fr.nextInt fr int arr[] =new int[n]; arr new int[n] n for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        } int i = 0; int i = 0; i 0 i < arr.length i arr.length arr arr.length i++ i++ i {
            arr[i] = fr.nextInt();
        } {
            arr[i] = fr.nextInt();
        } arr[i] = fr.nextInt() arr[i] arr i fr.nextInt() fr.nextInt fr int sums[]=new int[n]; sums new int[n] n Arrays.fill(sums,Integer.MAX_VALUE) Arrays.fill Arrays sums Integer.MAX_VALUE Integer Integer.MAX_VALUE sums[0]=0 sums[0] sums 0 0 sums[1]=Math.abs(arr[1]-arr[0]) sums[1] sums 1 Math.abs(arr[1]-arr[0]) Math.abs Math arr[1]-arr[0] arr[1] arr 1 arr[0] arr 0 for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        } int i=0; int i=0; i 0 i<n i n i++ i++ i {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        } {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        } int j=i+1; j i+1 i 1 int c=1; c 1 while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            } j<n&&c<=k j<n j n c<=k c k {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            } sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]) sums[j] sums j Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]) Math.min Math sums[i]+Math.abs(arr[j]-arr[i]) sums[i] sums i Math.abs(arr[j]-arr[i]) Math.abs Math arr[j]-arr[i] arr[j] arr j arr[i] arr i sums[j] sums j j++ j c++ c System.out.println(sums[n-1]) System.out.println System.out System System.out sums[n-1] sums n-1 n 1 String[] args args static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    } FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } FastReader {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } br = new BufferedReader(new
                    InputStreamReader(System.in)) br new BufferedReader(new
                    InputStreamReader(System.in)) String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } next {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
            return Long.parseLong(next());
        } nextLong {
            return Long.parseLong(next());
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
            return Double.parseDouble(next());
        } nextDouble {
            return Double.parseDouble(next());
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } nextLine {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } String str = ""; str "" try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                str = br.readLine();
            } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main {
    static int c=0;
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }



    public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    }




} public class Main {
    static int c=0;
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }



    public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    }




} Main





import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.Array;
import java.util.*;

public class Main {
    static int c=0;
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }



    public static void main(String[] args)throws IOException {
        FastReader fr = new FastReader();
        int n = fr.nextInt();
        int k=fr.nextInt();
        int arr[] =new int[n];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = fr.nextInt();
        }
        int sums[]=new int[n];
        Arrays.fill(sums,Integer.MAX_VALUE);
        sums[0]=0;
        sums[1]=Math.abs(arr[1]-arr[0]);
        for(int i=0;i<n;i++)
        {
            int j=i+1;
            int c=1;
            while(j<n&&c<=k)
            {
                sums[j]=Math.min(sums[i]+Math.abs(arr[j]-arr[i]),sums[j]);
                j++;
                c++;
            }
        }
        System.out.println(sums[n-1]);


    }




}
