import java.io.*;
import java.util.*;

public class hedge_mb_wa {
    static class Point {
        final int x, y;
        Point(int x, int y) {
            this.x = x;
            this.y = y;
        }
        Point subtract(Point that) {
            return new Point(x - that.x, y - that.y);
        }
        int vMul(Point that) {
            return x * that.y - y * that.x;
        }
        int sMul(Point that) {
            return x * that.x + y * that.y;
        }
        public String toString() {
            return "(" + x + "," + y + ")";
        }
    }

    static class Event implements Comparable<Event> {
        final int num, den;
        final int type;
        Event(int num, int den, int type) {
            this.type = type;
            if (den == 0) {
                throw new AssertionError(num + "/" + den);
            }
            if (den < 0) {
                num = -num;
                den = -den;
            }
            if (num < 0) {
                throw new AssertionError(num + "/" + den);
            }
            int a = den, b = num;
            while (a != 0) {
                int d = b % a;
                b = a;
                a = d;
            }
            this.num = num / b;
            this.den = den / b;
        }
        public int compareTo(Event that) {
            int cmp = Long.compare((long) (num) * that.den, (long) (den) * that.num);
            return cmp == 0 ? type - that.type : cmp;
        }
        public String toString() {
            return num + "/" + den + "@" + type;
        }
        public double toDouble() {
            return (double) (num) / den;
        }
    }

    static Point[] readPolygon(BufferedReader in) throws IOException {
        int n = Integer.parseInt(in.readLine());
        Point[] p = new Point[n];
        for (int i = 0; i < n; ++i) {
            String line = in.readLine();
            int ws = line.indexOf(' ');
            p[i] = new Point(Integer.parseInt(line.substring(0, ws)),
                             Integer.parseInt(line.substring(ws + 1)));
        }
        long area = 0;
        for (int i = 0; i < n; ++i) {
            area += p[i].vMul(p[(i + 1) % n]);
        }
        if (area < 0) {
            for (int i = 0, j = n - 1; i < j; ++i, --j) {
                Point tmp = p[i];
                p[i] = p[j];
                p[j] = tmp;
            }
        }
        return p;
    }

    static int[] vMuls(Point[] p) {
        int n = p.length;
        int[] rv = new int[n];
        for (int i = 0; i < n; ++i) {
            rv[i] = p[i].vMul(p[(i + 1) % n]);
        }
        return rv;
    }

    static Event solve(Point[] pNew, Point[] pOld) {
        int nNew = pNew.length;
        int nOld = pOld.length;
        int[] vmulNew = vMuls(pNew);
        int[] vmulOld = vMuls(pOld);
        List<Event> events = new ArrayList<>();

        for (int i = 0; i < nNew; ++i) {
            if (vmulNew[i] == 0) continue;
            int signI = Integer.signum(vmulNew[i]);
            for (int j = 0; j < nOld; ++j) {
                if (vmulOld[j] == 0) continue;
                int signJ = Integer.signum(vmulOld[j]);
                if (signI != signJ) continue;

                // old points pj, qj
                Point pj = pOld[j], qj = pOld[(j + 1) % nOld];
                // new points pi, qi
                Point pi = pNew[i], qi = pNew[(i + 1) % nNew];

                int vPIQI = vmulNew[i];
                int vPJQJ = vmulOld[j];
                int vPIPJ = pi.vMul(pj);
                int vPIQJ = pi.vMul(qj);
                int vQIPJ = qi.vMul(pj);
                int vQIQJ = qi.vMul(qj);

                int vectVmul = vPIQJ + vQIPJ - vPIPJ - vQIQJ;

                // testing pi against pj
                // testing pi against pj--qj
                if ((vPIPJ == 0 || Integer.signum(vPIPJ) != signI) && Integer.signum(vPIQJ) == signI) {
                    int eventSign = vectVmul == 0 || Integer.signum(vectVmul) == signI ? signI : 0;
                    events.add(new Event(vPJQJ, vPIQJ - vPIPJ, eventSign));
                }

                // testing qi against qj
                // testing qi against pj--qj
                if ((vQIQJ == 0 || Integer.signum(vQIPJ) != signI) && Integer.signum(vQIQJ) == signI) {
                    int eventSign = vectVmul == 0 || Integer.signum(vectVmul) != signI ? signI : 0;
                    events.add(new Event(vPJQJ, vQIQJ - vQIPJ, eventSign));
                }

                // testing pi--qi against pj
                if (Integer.signum(vPIPJ) == signI && Integer.signum(vQIPJ) != signI) {
                    int eventSign = vectVmul == 0 || Integer.signum(vectVmul) == signI ? signI : 0;
                    events.add(new Event(vPIPJ - vQIPJ, vPIQI, eventSign));
                }

                // testing pi--qi against qj
                if (Integer.signum(vPIQJ) == signI && Integer.signum(vQIQJ) != signI) {
                    int eventSign = vectVmul == 0 || Integer.signum(vectVmul) != signI ? signI : 0;
                    events.add(new Event(vPIQJ - vQIQJ, vPIQI, eventSign));
                }
            }
        }

        Collections.sort(events);
        int level = 0;
        Event last = null;
        Event last0 = null;
        for (Event e : events) {
            if (e.type == 1 && level == 0 && (last0 == null || last0.compareTo(e) < 0)) {
                last = e;
            }
            if (e.type == 0) {
                last0 = e;
            }
            level += e.type;
        }
        return last;
    }

    public static void main(String[] args) throws IOException {
        try (BufferedReader in = new BufferedReader(new InputStreamReader(System.in))) {
            Point[] pNew = readPolygon(in);
            Point[] pOld = readPolygon(in);
            Event solution = solve(pNew, pOld);
            System.out.println(solution.toDouble());
        }
    }
}