import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			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(ab>=c){
				ab-=c; bb+=c;
			}
			else{
				aw-=(c-ab); bw+=(c-ab);
				bb+=ab; ab=0;
			}
			if(bw>=d) aw+=d;
			else aw+=bw;
			System.out.println(aw);
		}
	}
}