Problem: Luba is surfing the Internet. She currently has n opened tabs in her browser, indexed from 1 to n from left to right. The mouse cursor is currently located at the pos-th tab. Luba needs to use the tabs with indices from l to r (inclusive) for her studies, and she wants to close all the tabs that don't belong to this segment as fast as possible.

Each second Luba can either try moving the cursor to the left or to the right (if the cursor is currently at the tab i, then she can move it to the tab max(i - 1, a) or to the tab min(i + 1, b)) or try closing all the tabs to the left or to the right of the cursor (if the cursor is currently at the tab i, she can close all the tabs with indices from segment [a, i - 1] or from segment [i + 1, b]). In the aforementioned expressions a and b denote the minimum and maximum index of an unclosed tab, respectively. For example, if there were 7 tabs initially and tabs 1, 2 and 7 are closed, then a = 3, b = 6.

What is the minimum number of seconds Luba has to spend in order to leave only the tabs with initial indices from l to r inclusive opened?

Input

The only line of input contains four integer numbers n, pos, l, r (1 ≤ n ≤ 100, 1 ≤ pos ≤ n, 1 ≤ l ≤ r ≤ n) — the number of the tabs, the cursor position and the segment which Luba needs to leave opened.

Output

Print one integer equal to the minimum number of seconds required to close all the tabs outside the segment [l, r].

Examples

Input

6 3 2 4


Output

5


Input

6 3 1 3


Output

1


Input

5 2 1 5


Output

0

Note

In the first test Luba can do the following operations: shift the mouse cursor to the tab 2, close all the tabs to the left of it, shift the mouse cursor to the tab 3, then to the tab 4, and then close all the tabs to the right of it.

In the second test she only needs to close all the tabs to the right of the current position of the cursor.

In the third test Luba doesn't need to do anything.

Solution (in JAVA):

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

import static java.lang.Integer.min;


public class Main {

    int LNF = (int) (2 * 1e9 + 1);

    ArrayList<road> g[];
    int sz[];

    public void solve() throws IOException {
        int n = nextInt();
        int pos = nextInt();
        int l = nextInt();
        int r = nextInt();
        if (l == 1) {
            int ans = Math.abs(pos - r);
            if (r != n) ans++;
            else ans = 0;
            pw.print(ans);
        } else if (r == n) {
            pw.print(Math.abs(pos - l) + 1);
        } else {
            int ans = 2;
            if (pos < l) {
                ans += l - pos;
                ans += r - l;
            } else if (pos > r) {
                ans += pos - r;
                ans += r - l;
            } else {
                ans += min(pos - l, r - pos) + r - l;
            }
            pw.print(ans);
        }
    }

    class road {
        int to;
        int w;

        public road(int t, int ww) {
            to = t;
            w = ww;
        }
    }

    public void run() {
        try {
//            br = new BufferedReader(new FileReader("input.txt"));
//            pw = new PrintWriter(new FileWriter("output.txt"));
            br = new BufferedReader(new InputStreamReader(System.in));
            pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
//            br = new BufferedReader(new FileReader("movie.in"));
//            pw = new PrintWriter(new FileWriter("movie.out"));
            solve();
            pw.close();
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    BufferedReader br;
    StringTokenizer in;
    PrintWriter pw;

    public String nextToken() throws IOException {
        while (in == null || !in.hasMoreTokens()) {
            in = new StringTokenizer(br.readLine());
        }
        return in.nextToken();
    }

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

    public long nextLong() throws IOException {
        return Long.parseLong(nextToken());
    }

    public static void main(String[] args) throws IOException {
        //Locale.setDefault(Locale.US);
        new Main().run();
    }
}