BFS

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.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.StringTokenizer;

public class Main {

    private static class Pair implements Comparable<Pair> {
        private Integer x;
        private Integer y;

        Pair(Integer x, Integer y) {
            this.x = x;
            this.y = y;
        }

        public Integer getX() {
            return x;
        }

        public void setX(Integer x) {
            this.x = x;
        }

        public Integer getY() {
            return y;
        }

        public void setY(Integer y) {
            this.y = y;
        }

        @Override
        public int compareTo(Pair o) {
            if (this.getX() < o.getX()) {
                return -1;
            } else if (this.getX() > o.getX()) {
                return 1;
            } else if (this.getX().equals(o.getX())) {
                if (this.getY() < o.getY()) {
                    return -1;
                } else {
                    return 1;
                }
            }
            return 0;
        }
    }

    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

    static class Task {

        private long dist(Pair a, Pair b) {
            return (long)Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
        }

        public void solve(InputReader in, PrintWriter out) {
            int n = in.nextInt();
            HashMap<Integer, Pair> points = new HashMap<>();
            HashMap<Integer, List<Integer>> g = new HashMap<>();
            Map<Integer, Integer> d = new HashMap<>();
            for (int i = 0; i < n; i++) {
                g.put(i, new LinkedList<>());
                d.put(i, 0);
                int x = in.nextInt(), y = in.nextInt();
                points.put(i, new Pair(x, y));
            }
            long k = in.nextLong();
            int start = in.nextInt() - 1, end = in.nextInt() - 1;

            for (int i = 0; i < n; i++) {
                for (int j = i + 1; j < n; j++) {
                    if (dist(points.get(i), points.get(j)) <= k) {
                        g.get(i).add(j);
                        g.get(j).add(i);
                    }
                }
            }

            Queue<Integer> q = new LinkedList<>();
            q.add(start);

            Set<Integer> used = new HashSet<>();
            used.add(start);

            while (!q.isEmpty()) {
                int v = q.poll();
                for (int to : g.get(v)) {
                    if (!used.contains(to)) {
                        used.add(to);
                        q.add(to);
                        d.put(to, d.get(v) + 1);
                    }
                }
            }
            if (used.contains(end)) {
                out.println(d.get(end));
            } else {
                out.println(-1);
            }
        }
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 2000);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

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

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

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

    }
}