import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import java.util.TreeMap;
import java.util.TreeSet;

import static java.util.Comparator.*;


public class Main {
	
	public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        MyInput in = new MyInput(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        
        Solver solver = new Solver();
        solver.solve(1, in, out);
        
        out.close();
    }
    
    // ======================================================================
    static class Solver {

    	public void solve(int testNumber, MyInput in, PrintWriter out) {
    		int N = in.nextInt();
    		int C = in.nextInt();
    		int K = in.nextInt();
    		int[] T = new int[N];
    		for(int i=0; i < N; i++) {
    			T[i] = in.nextInt();
    		}
    		if(C == 1) {
    		    out.println(N);
    		    return;
    		}
    		Arrays.sort(T);
    		int ans = 0;
    		long st = T[0];
    		long cnt = 1;
//    		out.println("初期条件　　人数 = " + N + "  定員 = " + C + "  待ち時間 = " + K);
//			out.println("先頭が待ってる状態　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st);
    		for(int i=1; i < N; i++) {
    			if(st != -1 && T[i]-st > K) {
//    				out.println("時間が過ぎたので出発する　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st + "   到着時間 = " + T[i]);
    				ans++;
    				cnt = 1;
    				st = T[i];
//    				out.println("時間が過ぎたので出発した後　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st);
    			} else {
    				cnt++;
    				if(cnt >= C) {
//        				out.println("人数が満杯になったので出発する　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st + "   到着時間 = " + T[i]);
    					ans++;
    					cnt = 0;
    					st = -1;
//        				out.println("人数が満杯になったので出発した後　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st);
    				} else {
    					if(st == -1)	st = T[i];
//        				out.println("待ってる人が増えた　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st + "   到着時間 = " + T[i]);
    				}
    			}
    		}
    		if(cnt > 0) {
    			ans++;
//				out.println("待ってる人が残っていたので乗せて出発　　 出発したバスの本数 = " + ans + "  待ってる人数 = " + cnt + "  先頭時間 = " + st);
    		}
// 人のコード　→　通る！
//            long ans = 0, zan = 0, limit = 0;
//            for (int i = 0; i < N; ++i) {
//                if (zan == 0 || limit < T[i]) {
//                    ans++;
//                    zan = C - 1;
//                    limit = T[i] + K;
//                } else {
//                    zan -= 1;
//                }
//            }
    		out.println(ans);
        }
    }
    static class PPP {
    	public int key, val;
    	public PPP(int key, int val) {
    		this.key = key;
    		this.val = val;
    	}
		public int getKey() {
			return key;
		}
		public void setKey(int key) {
			this.key = key;
		}
		public int getVal() {
			return val;
		}
		public void setVal(int val) {
			this.val = val;
		}
    }
    // ======================================================================
    static class Pair<K, V> extends AbstractMap.SimpleEntry<K, V> {
        /** serialVersionUID. */
        private static final long serialVersionUID = 6411527075103472113L;

        public Pair(final K key, final V value) {
            super(key, value);
        }
        public String getString() {
            return "[" + getKey() + "] [" + getValue() + "]";
        }
     }    
    static class MyInput {
        private final BufferedReader in;
        private static int pos;
        private static int readLen;
        private static final char[] buffer = new char[1024 * 8];
        private static char[] str = new char[500 * 8 * 2];
        private static boolean[] isDigit = new boolean[256];
        private static boolean[] isSpace = new boolean[256];
        private static boolean[] isLineSep = new boolean[256];
 
        static {
            for (int i = 0; i < 10; i++) {
                isDigit['0' + i] = true;
            }
            isDigit['-'] = true;
            isSpace[' '] = isSpace['\r'] = isSpace['\n'] = isSpace['\t'] = true;
            isLineSep['\r'] = isLineSep['\n'] = true;
        }
 
        public MyInput(InputStream is) {
            in = new BufferedReader(new InputStreamReader(is));
        }
 
        public int read() {
            if (pos >= readLen) {
                pos = 0;
                try {
                    readLen = in.read(buffer);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (readLen <= 0) {
                    throw new MyInput.EndOfFileRuntimeException();
                }
            }
            return buffer[pos++];
        }
 
        public int nextInt() {
            int len = 0;
            str[len++] = nextChar();
            len = reads(len, isSpace);
            int i = 0;
            int ret = 0;
            if (str[0] == '-') {
                i = 1;
            }
            for (; i < len; i++) ret = ret * 10 + str[i] - '0';
            if (str[0] == '-') {
                ret = -ret;
            }
            return ret;
        }
 
        public long nextLong() {
            int len = 0;
            str[len++] = nextChar();
            len = reads(len, isSpace);
            int i = 0;
            long ret = 0L;
            if (str[0] == '-') {
                i = 1;
            }
            for (; i < len; i++) ret = ret * 10 + str[i] - '0';
            if (str[0] == '-') {
                ret = -ret;
            }
            return ret;
        }
 
        public String nextString() {
        	String ret = new String(nextDChar()).trim();
            return ret;
        }
 
        public char[] nextDChar() {
            int len = 0;
            len = reads(len, isSpace);
            char[] ret = new char[len + 1];
            for (int i=0; i < len; i++)		ret[i] = str[i];
            ret[len] = 0x00;
            return ret;
        }
 
        public char nextChar() {
            while (true) {
                final int c = read();
                if (!isSpace[c]) {
                    return (char) c;
                }
            }
        }
 
        int reads(int len, boolean[] accept) {
            try {
                while (true) {
                    final int c = read();
                    if (accept[c]) {
                        break;
                    }
                    if (str.length == len) {
                        char[] rep = new char[str.length * 3 / 2];
                        System.arraycopy(str, 0, rep, 0, str.length);
                        str = rep;
                    }
                    str[len++] = (char) c;
                }
            } catch (MyInput.EndOfFileRuntimeException e) {
            }
            return len;
        }
 
        static class EndOfFileRuntimeException extends RuntimeException {
        }
    }
}


Measured memory_bytes: 24136