import java.util.Scanner;
public class No149 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int aw = s.nextInt() , ab = s.nextInt() , bw = s.nextInt() , bb = s.nextInt() , c = s.nextInt() , d = s.nextInt();
		s.close();

		if(Math.min(ab, c) == ab){
			aw -= c - ab;
			bw += c - ab;
			bb = ab;
		}else{
			bb = c;
		}
		if(Math.min(bw, d) == bw){
			aw += bw;
		}else{
			aw += d;
		}
		System.out.println(aw);


	}

}