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.BufferedReader;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.*;
import java.io.*;

public class abc {
	static PrintWriter pw;

	/*
	 * static long inv[]=new long[1000001]; static long dp[]=new long[1000001];
	 */
	/// MAIN FUNCTION///
	public static void main(String[] args) throws Exception {

		FastReader sc = new FastReader();
		pw = new PrintWriter(System.out);
		// use arraylist as it use the concept of dynamic table(amortized analysis)
		// Arrays.stream(array).forEach(a -> Arrays.fill(a, 0));
		/* List<Integer> l1 = new ArrayList<Integer>(); */
		int tst = 1;
		while (tst-- > 0) {
			int n=sc.nextInt();
			int pos=sc.nextInt();
			int l=sc.nextInt();
			int r=sc.nextInt();
			int rem1=l-1;
			int rem2=n-r;
			if(rem1==0 && rem2==0)
				pw.println(0);
			else 
			{
				if(rem1==0 && rem2!=0)
				{
					pw.println(1+Math.abs(r-pos));
				}
				else if(rem2==0 && rem1!=0)
				{
					pw.println(1+Math.abs(pos-l));
				}
				else
				{
					pw.println(2+min(Math.abs(pos-l),Math.abs(r-pos))+(r-l));
				}
			}
		}
		pw.flush();
	}
	
	public static int helper(int a[],int n,int i,int sum) {
		if(i==n-1)
			return sum;
		if(sum>=0)
			return sum=a[i]+helper(a,n,i+1,sum);
		else
			return sum=helper(a,n,i+1,sum);
	}
	
	static void recursion(int n) {
		if (n == 1) {
			pw.print(n + " ");
			return;
		}
		// pw.print(n+" "); gives us n to 1
		recursion(n - 1);
		// pw.print(n+" "); gives us 1 to n
	}

	// ch.charAt(i)+"" converts into a char sequence
	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st == null || !st.hasMoreElements()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			return st.nextToken();
		}

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

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

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

		String nextLine() {
			String str = "";
			try {
				str = br.readLine();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return str;
		}

		/* CREATED BY ME */
		int[] readArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}
		long[] readLongArray(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nextLong();
			return a;
		}
	}

	public static long gcd(long a, long b) {
		return b == 0 ? a : gcd(b, a % b);
	}

	public static boolean isPrime(long n) {
		if (n == 2)
			return true;
		long i = 2;
		while (i * i <= n) {
			if (n % i == 0)
				return false;
			i++;
		}
		return true;
	}

	static int ceil(int x, int y) {
		return (x % y == 0 ? x / y : (x / y + 1));
	}

	static long ceil(long x, long y) {
		return (x % y == 0 ? x / y : (x / y + 1));
	}

	static double max(double x, double y) {
		return Math.max(x, y);
	}

	static int min(int x, int y) {
		return Math.min(x, y);
	}

	static int abs(int x) {
		return Math.abs(x);
	}

	static long abs(long x) {
		return Math.abs(x);
	}

	static int log2(int N) {
		int result = (int) (Math.log(N) / Math.log(2));
		return result;
	}

	static long max(long x, long y) {
		return Math.max(x, y);
	}

	static long min(long x, long y) {
		return Math.min(x, y);
	}

	public static class pair {
		int x;
		int y;

		public pair(int a, int b) {
			x = a;
			y = b;
		}
	}

	public static class Comp implements Comparator<pair> {
		public int compare(pair a, pair b) {
			if (a.x != b.x) {
				return a.x - b.x;
			} else {
				return a.y - b.y;
			}
		}
	}

	// modular exponentiation
	public static long fastExpo(long a, int n, int mod) {
		if (n == 0)
			return 1;
		else {
			if ((n & 1) == 1) {
				long x = fastExpo(a, n / 2, mod);
				return (((a * x) % mod) * x) % mod;
			} else {
				long x = fastExpo(a, n / 2, mod);
				return (((x % mod) * (x % mod)) % mod) % mod;
			}
		}
	}

	public static long modInverse(long n, int p) {
		return fastExpo(n, p - 2, p);
	}

	/*
	 * public static void extract(ArrayList<Integer> ar, int k, int d) { int c = 0;
	 * for (int i = 1; i < k; i++) { int x = 0; boolean dm = false; while (x > 0) {
	 * long dig = x % 10; x = x / 10; if (dig == d) { dm = true; break; } } if (dm)
	 * ar.add(i); } }
	 */

	public static int[] prefixfuntion(String s) {
		int n = s.length();
		int z[] = new int[n];
		for (int i = 1; i < n; i++) {
			int j = z[i - 1];
			while (j > 0 && s.charAt(i) != s.charAt(j))
				j = z[j - 1];
			if (s.charAt(i) == s.charAt(j))
				j++;
			z[i] = j;
		}
		return z;
	}

	public static void dfs(int index, boolean vis[], int a[], int b[], int n) {
		vis[index] = true;
		for (int i = 0; i < n; i++) {
			if (!vis[i] && (a[i] == a[index] || b[i] == b[index]))
				dfs(i, vis, a, b, n);
		}
	}

// counts the set(1) bit of a number
	public static long countSetBitsUtil(long x) {
		if (x <= 0)
			return 0;
		return (x % 2 == 0 ? 0 : 1) + countSetBitsUtil(x / 2);
	}

//tells whether a particular index has which bit of a number	
	public static int getIthBitsUtil(int x, int y) {
		return (x & (1 << y)) != 0 ? 1 : 0;
	}

	public static void swap(long x, long y) {
		x = x ^ y;
		y = y ^ x;
		x = x ^ y;
	}

	/*
	 * static long mod_inverse(long a, long b) { long mod=(long) (1000000007); long
	 * ans=1; while(b>0) { if((b%2)==0) ans=(ans*a) %mod; b/=2; a=(a*a) % mod;
	 * 
	 * } return ans; }
	 */

	public static double decimalPlaces(double sum) {
		DecimalFormat df = new DecimalFormat("#.00");
		String angleFormated = df.format(sum);
		double fin = Double.parseDouble(angleFormated);
		return fin;
	}

//use collections.swap for swapping 
	static boolean isSubSequence(String str1, String str2, int m, int n) {
		int j = 0;

		for (int i = 0; i < n && j < m; i++)
			if (str1.charAt(j) == str2.charAt(i))
				j++;

		return (j == m);
	}

	static long sum(long n) {
		long s2 = 0, max = -1, min = 10;
		while (n > 0) {
			s2 = (n % 10);
			min = min(s2, min);
			max = max(s2, max);
			n = n / 10;
		}
		return max * min;
	}

	static long pow(long base, long power) {
		if (power == 0) {
			return 1;
		}
		long result = pow(base, power / 2);
		if (power % 2 == 1) {
			return result * result * base;
		}
		return result * result;
	}

	// return the hash value of a string
	static long compute_hash(String s) {
		long val = 0;
		long p = 31;
		long mod = (long) (1000000007);
		long pow = 1;
		for (int i = 0; i < s.length(); i++) {
			char ch = s.charAt(i);
			val = (val + (int) (ch - 'a' + 1) * pow) % mod;
			pow = (pow * p) % mod;
		}
		return val;
	}

	// return a prefix sum array of hash values
	/*
	 * static void prefix_array_value(String s) { long p=31; long mod=(long)
	 * (1000000007); long pow=1; inv[0]=1; dp[0]=(long)(s.charAt(0)-'a'+1);
	 * 
	 * for(int i=1;i<s.length();i++) { char ch=s.charAt(i); pow= ( pow*p ) % mod;
	 * inv[i]=mod_inverse(pow, mod-2); dp[i]=(dp[i-1]+ (long)(ch- 'a' +1)*pow)%mod;
	 * } }
	 */

	/*
	 * static long substringHash(int L , int R ) { long result = dp[R]; long
	 * mod=(long) (1000000007); if(L > 0) result = (result - dp[L-1] + mod) % mod;
	 * result= (result * inv[L]) % mod; return result; }
	 */
}