import java.util.Scanner;
public class No149 {
	public static void main (String[] args){
	Scanner sc =new Scanner(System.in);
	int aw=sc.nextInt() ,ab=sc.nextInt();
	int bw=sc.nextInt();
	sc.nextInt();
	int c=sc.nextInt(),d=sc.nextInt();
	bw-=ab<c?ab-c:0;
	System.out.println(aw+(bw<d?bw:d)+(ab<c?ab-c:0));
	}
}