10 5 5
2 3 4 5 6
 1 1 1
1
 1000000000000000000 10 68
9818112234872670 233245257111863071 266483628625876079 375103213040049805 431982380866113633 489732004669478331 501030096787260719 541800997319766183 551892546260532408 696178619227890200
 1000000000000000000 2 1
1 1000000000000000000
 33 32 1
1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
 101 55 10
1 3 5 7 8 9 10 16 18 21 22 23 24 25 27 30 32 35 36 37 38 39 40 43 45 47 49 50 51 52 54 57 59 61 64 66 67 68 69 70 71 72 73 80 83 86 87 88 89 90 91 92 96 97 98
 1000000000000000000 5 1000
1 1000000000 1000000000000 1000000000000000 1000000000000001
 15 15 15
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
 21 21 20
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
 45 43 2
1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
 107 20 13
5 9 20 25 26 30 37 45 51 58 62 73 82 87 89 90 99 101 104 106
 3 2 1
1 2
 1000000000 2 1000000000
1 1000000000
 11 7 3
2 3 4 5 6 7 11
 13 9 4
1 2 3 6 7 8 11 12 13
 1000000000000000000 2 1000000000
102306300054748096 267367244641009859
 16 7 5
2 3 4 5 6 15 16
 35 35 1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
 1000000000000000000 20 365
31881893160049984 103938857870698567 103962228223609431 140762820261865064 175962215264653912 239086305245565642 354522451098745823 383839975876242372 443471287955807705 478923027151493682 511195154588214957 619570919279066139 677571312513476877 705864797651447277 789633853044745934 867300890280086078 883297431113041450 891736036124527038 937306858250803630 990892290394455512

2
 1
 10
 2
 32
 15
 4
 1
 2
 35
 9
 2
 1
 4
 4
 2
 4
 35
 20

import java.io.*;
import java.util.*;
import java.math.*;
public class temp
{
    static FastReader s;;
    static int dp[];
    static PrintWriter out;
    static class pair
    {
        int a,b;
        pair(int x, int y)
        {
            a=x;
            b=y;
        }
    }
    public static void main(String[] args) throws IOException
    {
        
        s = new FastReader();
        out=new PrintWriter(System.out);
        long n = s.nl();
        int m = s.ni();
        long k = s.nl();
        Long arr[] = larr(m);
        long count = 0;
        long ans = 0;
        for (int i = 0; i < m; i++)
        {
            long x = (long)((long)(arr[i]-count-1) / (double)k);
            int j = i;
            //println(arr[i]); 
            long lcount = 0;
            while (j < m && (long)((long)(arr[j] - count-1)/ (double)k) == x)
            {
                //println(arr[j]);
                j++;
                lcount++;
                
            }
            count += lcount;
            i = j-1;
            ans++;
        }
        println(ans);
        out.flush();
        out.close();

    }  
    
    /*static int gcd(int a, int b) 
    { 
      if (b == 0) 
        return a; 
      return gcd(b, a % b);  
    }

    static long lgcd(long a, long b) 
    { 
      if (b == 0) 
        return a; 
      return lgcd(b, a % b);  
    }*/

    

    static class FastReader
    {

        BufferedReader br;
        StringTokenizer st;

        public FastReader()
        {
            br = new BufferedReader(new InputStreamReader(System.in));
        }
        public FastReader(String file_name) throws IOException
        {
            br = new BufferedReader(new FileReader(file_name));
        }
        String next()
        {
            while (st == null || !st.hasMoreElements())
            {
                try
                {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e)
                {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

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

        long nl()
        {
            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;
        }
        
    }

    static void piarr(int arr[])
    {
        int n = arr.length;
        for (int i = 0; i < n; i++)
        {
            print(arr[i]+" ");
        }
        println("");
    }

    static void plarr(long arr[])
    {
        int n = arr.length;
        for (int i = 0; i < n; i++)
        {
            print(arr[i]+" ");
        }
        println("");
    }

    static void println(Object line) 
    {
        out.println(line);
    }
    static void print(Object line) 
    {
        out.print(line);
    }
    static Integer[] iarr(int n)
    {
        Integer arr[]=new Integer[n];
        for(int i = 0; i < n;i++)
            arr[i]=s.ni();
        return arr;
    }

    static Long[] larr(int n)
    {
        Long arr[]=new Long[n];
        for(int i = 0; i < n;i++)
            arr[i]=s.nl();
        return arr;
    }

    static Integer[][] i2arr(int n, int m)
    {
        Integer arr[][]=new Integer[n][m];
        for(int i = 0; i < n;i++)
            for(int j = 0; j < m;j++)
                arr[i][j]=s.ni();
        return arr;
    }

    static Long[][] l2arr(int n, int m)
    {
        Long arr[][]=new Long[n][m];
        for(int i = 0; i < n;i++)
            for(int j = 0; j < m;j++)
                arr[i][j]=s.nl();
        return arr;
    }

    static char [] nc()
    {
        String str = s.next();
        char c[] = str.toCharArray();
        return c;
    }
    static char [][] n2c(int n)
    {
        char c[][] = new char[n][];
        for (int i = 0; i < n; i++)
            c[i] = s.next().toCharArray();
        return c;
    }

}