import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int aw = sc.nextInt();
		int ab = sc.nextInt();
		int bw = sc.nextInt();
		int bb = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		bw += Math.max(c - ab, 0);
		aw -= Math.max(c - ab, 0);
		bb += Math.min(ab, c);
		aw += Math.min(d, bw);
		System.out.println(aw);
	}
}