package yukicoder149;
import java.util.Scanner;
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();
		
		//1回目
		if(c<=ab){
			ab-=c;
			bb+=c;
		}else if(c>ab){
			bb+=ab;
			aw-=c-ab;
			bw+=c-ab;
			ab=0;
		}
		//2回目
		if(d>bw){
			System.out.println(aw+bw);
		}else{
			System.out.println(aw+d);
		}
	}
}