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();
        if (c <= ab) {
            ab -= c;
            bb += c;
        } else {
            int t = c - ab;
            bb += ab;
            ab = 0;
            aw -= t;
            bw += t;
        }
        if (d <= bw) {
            aw += d;
        } else {
            aw += bw;
        }
        System.out.println(aw);
    }
}