import java.util.*;

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();
        int r;
        
        if(C<=Ab){
            if(D>=Bw){
                r=Aw+Bw;
            }else{
                r=Aw+D;
            }
        }else{
            Aw=Aw-(C-Ab);
            Bw=Bw+(C-Ab);
            Bb=Bb+Ab;
            if(D>=Bw){
                r=Aw+Bw;
            }else{
                r=Aw+D;
            }
        }
        System.out.println(r);
    }
}