import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.PrimitiveIterator;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        PrintWriter pw = new PrintWriter(System.out);
        StringBuilder sb = new StringBuilder();
        int n = nextInt(sc);
        int k = nextInt(sc);
        int q = nextInt(sc);
        int[] a = new int[n];
        Arrays.setAll(a, i -> nextInt(sc));
        int[] b = new int[n];
        IntPriorityQueue pq = new IntPriorityQueue();
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < n; i++) {
            pq.clear();
            IntArrayList l = new IntArrayList();
            l.add(-1);
            for (int j = 0; j < n; j++) {
                if (a[j] < a[i]) {
                    l.add(j);
                }
            }
            int m = l.size();
            l.add(n);
            System.arraycopy(a, 0, b, 0, n);
            for (int u = 0; u < m; u++) {
                int x = l.get(u) + 1;
                int y = l.get(u + 1);
                if (y - x < k) continue;
                Arrays.sort(b, x, y);
                for (int z = 0; z < y - x - k + 1; z++) {
                    pq.push(b[x + z]);
                }
            }
            if (pq.size() < q) continue;
            int x = -1;
            int y = -1;
            for (int t = 0; t < q; t++) {
                int v = pq.pop();
                if (t == 0) x = v;
                if (t == q - 1) y = v;
            }
            min = Math.min(min, y - x);
            
        }
        sb.append(min).append('\n');
        pw.write(sb.toString());
        pw.flush();
        pw.close();
    }

    public static int nextInt(Scanner sc) {
        return Integer.parseInt(sc.next());
    }
    public static long nextLong(Scanner sc) {
        return Long.parseLong(sc.next());
    }
}

class IntArrayList implements Iterable<Integer> {

    static final int DEFAULT_CAPACITY = 64;

    int[] a;
    int tail = 0;
    
    public IntArrayList(int capacity) {
        if (capacity <= 0) {
            throw new IllegalArgumentException();
        }
        this.a = new int[capacity];
    }

    public IntArrayList() {
        this(DEFAULT_CAPACITY);
    }

    public void add(int v) {
        if (tail == a.length) grow();
        a[tail++] = v;
    }

    public int removeLast() {
        if (tail == 0) throw new NoSuchElementException();
        return a[--tail];
    }

    public int get(final int i) {
        if (i < 0 || i >= tail) throw new IndexOutOfBoundsException("Index " + i + " out of bounds for length " + size());
        return a[i];
    }

    public void set(final int i, final int v) {
        if (i < 0 || i >= tail) throw new IndexOutOfBoundsException("Index " + i + " out of bounds for length " + size());
        a[i] = v;
    }

    void grow() {
        int[] b = new int[a.length << 1];
        System.arraycopy(a, 0, b, 0, a.length);
        a = b;
    }

    public int size() {
        return tail;
    }

    public void clear() {
        tail = 0;
    }

    public void reverse(int fromIndex, int toIndex) {
        int l = fromIndex, r = toIndex - 1;
        while (l < r) {
            int tmp = a[l]; a[l] = a[r]; a[r] = tmp;
            l++; r--;
        }
    }

    public void reverse() {
        reverse(0, tail);
    }

    public int[] toArray() {
        final int[] ret = new int[tail];
        System.arraycopy(a, 0, ret, 0, tail);
        return ret;
    }

    public void sort() {
        Arrays.sort(a, 0, tail);
    }

    public PrimitiveIterator.OfInt iterator() {
        return new PrimitiveIterator.OfInt(){
            int i = 0;
            public boolean hasNext() {return i < tail;}
            public int nextInt() {return a[i++];}
        };
    }
}

class IntPriorityQueue {
    static final int DEFAULT_CAPACITY = 1 << 6;

    @FunctionalInterface
    public static interface IntComparator {public int compare(int a, int b);}

    int[] que;

    final IntComparator comparator;
    final boolean descending;

    int size = 0;

    public IntPriorityQueue(int capacity, boolean descending) {
        int k = 1;
        while (k < capacity) k <<= 1;
        this.que = new int[k];
        this.comparator = null;
        this.descending = descending;
        this.size = 0;
    }

    public IntPriorityQueue(int capacity) {
        this(capacity, false);
    }

    public IntPriorityQueue(boolean descending) {
        this(DEFAULT_CAPACITY, descending);
    }

    public IntPriorityQueue() {
        this(DEFAULT_CAPACITY, false);
    }

    public IntPriorityQueue(int capacity, IntComparator comparator) {
        int k = 1;
        while (k < capacity) k <<= 1;
        this.que = new int[k];
        this.comparator = comparator;
        this.descending = false;
        this.size = 0;
    }

    public IntPriorityQueue(IntComparator comparator) {
        this(DEFAULT_CAPACITY, comparator);
    }

    public void push(int e) {
        if (++size == que.length) grow();
        if (comparator != null) {
            pushUsingComparator(e);
        } else if (descending) {
            pushDescending(e);
        } else {
            pushAscending(e);
        }
    }

    void grow() {
        int[] newQue = new int[que.length << 1];
        System.arraycopy(que, 0, newQue, 0, que.length);
        que = newQue;
    }

    void pushUsingComparator(int e) {
        int i = size;
        while (i > 1) {
            int p = i >> 1;
            if (comparator.compare(e, que[p]) >= 0) break;
            que[i] = que[i = p];
        }
        que[i] = e;
    }

    void pushDescending(int e) {
        int i = size;
        while (i > 1) {
            int p = i >> 1;
            if (e <= que[p]) break;
            que[i] = que[i = p];
        }
        que[i] = (int) e;
    }

    void pushAscending(int e) {
        int i = size;
        while (i > 1) {
            int p = i >> 1;
            if (e >= que[p]) break;
            que[i] = que[i = p];
        }
        que[i] = (int) e;
    }

    public int pop() {
        if (comparator != null) {
            return popUsingComparator();
        } else if (descending) {
            return popDescending();
        } else {
            return popAscending();
        }
    }

    int popUsingComparator() {
        int ret = que[1];
        int e = que[size--];
        int i = 1;
        int h = size >> 1;
        while (i <= h) {
            int l = i << 1 | 0, r = i << 1 | 1;
            if (r <= size) {
                if (comparator.compare(que[l], que[r]) > 0) {
                    if (comparator.compare(e, que[r]) <= 0) break;
                    que[i] = que[i = r];
                } else {
                    if (comparator.compare(e, que[l]) <= 0) break;
                    que[i] = que[i = l];
                }
            } else {
                if (comparator.compare(e, que[l]) <= 0) break;
                que[i] = que[i = l];
            }
        }
        que[i] = e;
        return ret;
    }

    int popDescending() {
        int ret = que[1];
        int e = que[size--];
        int i = 1;
        int h = size >> 1;
        while (i <= h) {
            int l = i << 1 | 0, r = i << 1 | 1;
            if (r <= size) {
                if (que[l] < que[r]) {
                    if (e >= que[r]) break;
                    que[i] = que[i = r];
                } else {
                    if (e >= que[l]) break;
                    que[i] = que[i = l];
                }
            } else {
                if (e >= que[l]) break;
                que[i] = que[i = l];
            }
        }
        que[i] = (int) e;
        return ret;
    }

    int popAscending() {
        int ret = que[1];
        int e = que[size--];
        int i = 1;
        int h = size >> 1;
        while (i <= h) {
            int l = i << 1 | 0, r = i << 1 | 1;
            if (r <= size) {
                if (que[l] > que[r]) {
                    if (e <= que[r]) break;
                    que[i] = que[i = r];
                } else {
                    if (e <= que[l]) break;
                    que[i] = que[i = l];
                }
            } else {
                if (e <= que[l]) break;
                que[i] = que[i = l];
            }
        }
        que[i] = (int) e;
        return ret;
    }

    public int size() {
        return size;
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public void clear() {
        size = 0;
    }

    public static void main(String[] args) {
        IntPriorityQueue pq = new IntPriorityQueue(1, true);
        pq.push(  3); pq.push(  4); pq.push(  1); pq.push(- 1);
        pq.push( 10); pq.push( 14); pq.push( 30); pq.push(- 3);
        pq.push(-13); pq.push( 32); pq.push( 13); pq.push(  7);
        pq.push(- 7); pq.push( 12); pq.push(-29); pq.push(- 2);
        pq.push(  0); pq.push(  1); pq.push( 10);
        while (pq.size() > 0) {
            System.out.print(pq.pop());
            if (pq.size() > 0) {
                System.out.print(", ");
            } else {
                System.out.println();
            }
        }
    }
}

Measured memory_bytes: 60112