package no3679_nannkadekkaimushi;
import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		sc.nextInt();
		sc.nextInt();
		int x = sc.nextInt();
		int y = sc.nextInt();
		int hf = sc.nextInt();
		int wf = sc.nextInt();
		int he = sc.nextInt();
		int we = sc.nextInt();
		int p = sc.nextInt();
		int q = sc.nextInt();
		int ans = Math.abs(p - x) + Math.abs(q - y);
		int l = 0;
		//初期位置が虫の上
		if(x <= hf) {
			//System.out.println("Up");
			//左側
			if(y <= wf) {
				l = Math.abs(y - wf) + Math.abs(x - hf);
				x = hf;
				y = wf;
			}//右側
			else if(y > we) {
				l = Math.abs(y - we) + Math.abs(x - hf);
				x = hf;
				y = wf;
			}//真上
			else {
				l = Math.abs(x - hf);
				x = hf;
			}
		}//初期位置が虫と同じくらいの高さ
		else if(x > hf && x <= he) {
			//左側
			if(y <= wf) {
				l = Math.abs(wf - y);
				y = wf;
			}//右側
			else if(y > we) {
				l = Math.abs(we - y);
				y = we;
			}//それ以外は動かない
			
		}//初期位置が虫の下
		else if(x > he) {
			//左
			if(y <= wf) {
				l = Math.abs(x - he) + Math.abs(y - wf);
				x = he;
				y = wf;
			}//右
			else if(y > we) {
				l = Math.abs(x - he) + Math.abs(y - we);
				x = he;
				y = we;
			}//真下
			else {
				l = Math.abs(x - he);
				x = he;
			}
		}ans += l + Math.abs(p - x) + Math.abs(q - y);
		System.out.println(ans);
	}

}