Problem: Consider a system of n water taps all pouring water into the same container. The i-th water tap can be set to deliver any amount of water from 0 to ai ml per second (this amount may be a real number). The water delivered by i-th tap has temperature ti.

If for every <image> you set i-th tap to deliver exactly xi ml of water per second, then the resulting temperature of water will be <image> (if <image>, then to avoid division by zero we state that the resulting water temperature is 0).

You have to set all the water taps in such a way that the resulting temperature is exactly T. What is the maximum amount of water you may get per second if its temperature has to be T?

Input

The first line contains two integers n and T (1 ≤ n ≤ 200000, 1 ≤ T ≤ 106) — the number of water taps and the desired temperature of water, respectively.

The second line contains n integers a1, a2, ..., an (1 ≤ ai ≤ 106) where ai is the maximum amount of water i-th tap can deliver per second.

The third line contains n integers t1, t2, ..., tn (1 ≤ ti ≤ 106) — the temperature of water each tap delivers.

Output

Print the maximum possible amount of water with temperature exactly T you can get per second (if it is impossible to obtain water with such temperature, then the answer is considered to be 0).

Your answer is considered correct if its absolute or relative error doesn't exceed 10 - 6.

Examples

Input

2 100
3 10
50 150


Output

6.000000000000000


Input

3 9
5 5 30
6 6 10


Output

40.000000000000000


Input

2 12
1 3
10 15


Output

1.666666666666667

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Solution {

    public static void solve(InputReader in, PrintWriter out, DebugWriter debug) throws IOException {
        int n = in.nextInt();
        long T = in.nextInt();
        int[] a = in.nextIntArray(n);
        int[] t = in.nextIntArray(n);

        Tap[] taps = new Tap[n];
        for (int i = 0; i < n; i++) {
            taps[i] = new Tap();
            taps[i].waterInSecMax = a[i];
            taps[i].waterInSecNow = a[i];
            taps[i].temp = t[i];
        }

        Arrays.sort(taps);

        long up = 0, down = 0;
        for (int i = 0; i < n; i++) {
            up += taps[i].waterInSecMax*taps[i].temp;
            down += taps[i].waterInSecMax;
        }

        double nowTemp = getTemp(up, down);
        if (nowTemp == T){
            out.println(down);
            return;
        }

        int pos = -1;
        if (nowTemp > T){
            for (int i = n-1; i >= 0; i--) {
                up -= taps[i].waterInSecMax*taps[i].temp;
                down -= taps[i].waterInSecMax;
                taps[i].waterInSecNow = 0;

                if (getTemp(up, down) <= T){
                    pos = i;
                    break;
                }
            }
        } else {
            for (int i = 0; i < n; i++) {
                up -= taps[i].waterInSecMax*taps[i].temp;
                down -= taps[i].waterInSecMax;
                taps[i].waterInSecNow = 0;

                if (getTemp(up, down) >= T){
                    pos = i;
                    break;
                }
            }
        }

        if (pos == -1){
            out.println(0);
        } else {
            double ans = ((double) (T * down - up)) / (taps[pos].temp - T);
            out.println(down + ans);
        }
    }

    public static double getTemp(long up, long down){
        return ((double) up)/down;
    }

    public static class Tap implements Comparable<Tap>{

        public long waterInSecMax;
        public long waterInSecNow = 0;
        public long temp;

        @Override
        public int compareTo(Tap tap) {
            return Long.compare(temp, tap.temp);
        }
    }

    public static final String NAME = "";

    public static void main(String[] args) throws IOException{
        InputReader in;
        PrintWriter out;
        DebugWriter debug;

        if (args.length > 0 && args[0].equals("file")) {
            in = new InputReader(new BufferedReader(new FileReader("input.txt")));
            out = new PrintWriter(new FileWriter("output.txt"));
            debug = new DebugWriter(true);

            int sampleNumber = 1;
            do {
                String nextSample = "Sample #" + sampleNumber++ + ": ";
                out.println(nextSample);
                debug.println(nextSample);

                solve(in, out, debug);

                out.println("");
                debug.println("");
            } while (in.reader.readLine() != null);
        } else {
            if (NAME.length() > 0) {
                in = new InputReader(new BufferedReader(new FileReader(NAME + ".in")));
                out = new PrintWriter(new FileWriter(NAME + ".out"));
            } else {
                in = new InputReader(new BufferedReader(new InputStreamReader(System.in)));
                out = new PrintWriter(new OutputStreamWriter(System.out));
            }

            debug = new DebugWriter(false);
            solve(in, out, debug);
        }

        in.reader.close();
        out.close();
    }

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

        public InputReader(BufferedReader reader) {
            this.reader = reader;
            tokenizer = null;
        }

        public String next() throws IOException{
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                tokenizer = new StringTokenizer(reader.readLine());
            }

            return tokenizer.nextToken();
        }

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

        public int[] nextIntArray(int n) throws IOException{
            int[] array = new int[n];
            for (int i=0; i<n; i++){
                array[i] = nextInt();
            }

            return array;
        }
    }

    public static class DebugWriter {
        public boolean enable;

        public DebugWriter(boolean enable){
            this.enable = enable;
        }

        public void print(Object o){
            if (enable) System.out.print(o);
        }

        public void println(Object o){
            if (enable) System.out.println(o);
        }
    }

}