import java.util.Scanner;
import java.util.stream.IntStream;

/**
 * Created by nullzine on 2017/01/19.
 */
public class Main {

    public static void main(String[] args){
        new Main().run2();
    }

    private void run(){
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        String[] strs = sc.nextLine().split(" ");
        int a=Integer.parseInt(strs[0]),b=Integer.parseInt(strs[1]),c=Integer.parseInt(strs[2]);
        System.out.println(IntStream.range(1,n+1).parallel().filter(f -> f % a == 0 || f % b == 0 || f % c == 0).toArray().length);
    }

    private void run2(){
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine());
        String[] strs = sc.nextLine().split(" ");
        int a=Integer.parseInt(strs[0]),b=Integer.parseInt(strs[1]),c=Integer.parseInt(strs[2]);
        Count count = new Count();
        IntStream.range(1,n+1).parallel().forEach(e->{
            if(e % a == 0 || e % b == 0 || e % c == 0){
                synchronized (count){
                    count.count++;
                }
            }
        });
        System.out.println(count.count);
    }

    class Count{

        public int count=0;

    }

}