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){
        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).filter(f->f%a==0||f%b==0||f%c==0).toArray().length);
    }

}