import java.util.*;
public class Stone {
	public static void main(String[] arg){
		int aw,ab,bw,bb,c,d;
		Scanner sc = new Scanner(System.in);
		aw = sc.nextInt();
		ab = sc.nextInt();
		bw = sc.nextInt();
		bb = sc.nextInt();
		c = sc.nextInt();
		d = sc.nextInt();
		if(c>ab){
			bb = bb + ab;
			aw = aw +ab - c;
			bw = bw + c - ab;
			ab = 0;
		}else{
			bb = bb + c;
			ab = ab - c;
		}
		if(d>bw){
			aw = aw + bw;
			bb = bb +bw -d;
			ab = ab + d - bw;
			bw = 0;
		}else{
			aw = aw + d;
			bw = bw -d;
		}
		System.out.println(aw);
	}
}