import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int Aw = scan.nextInt();
		int Ab = scan.nextInt();
		int Bw = scan.nextInt();
		int Bb = scan.nextInt();
		int C = scan.nextInt();
		int D = scan.nextInt();
		scan.close();
		if(C >= Ab) {
			int w = C - Ab;
			int b = Ab;
			Aw = Aw - w;
			Bw = Bw + w;
			Bb = Bb + b;
			if(D <= Bw) {
				Aw = Aw + D;
			}else {
				Aw = Aw + Bw;
			}
		}else {
			int b = C;
			Bb = Bb + b;
			if(D <= Bw) {
				Aw = Aw + D;
			}else {
				Aw = Aw + Bw;
			}
		}
		System.out.println(Aw);
	}
}