import java.util.Scanner;


public class GO {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int aw,ab,bw,bb,c,d;
        aw = sc.nextInt();
        ab = sc.nextInt();
        bw = sc.nextInt();
        bb = sc.nextInt();
        c = sc.nextInt();
        d = sc.nextInt();
        if(ab >= c){
            ab -= c;
            bb += c;
        } else {
            aw -= (c-ab);
            bw += (c-ab);
            bb += ab;
            ab = 0;
        }
        
        System.out.println(aw + Math.min(d, bw));
    }

}