import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        MoreFizzBuzz solver = new MoreFizzBuzz();
        solver.solve(1, in, out);
        out.close();
    }

    static class MoreFizzBuzz {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 包徐原理を用いればいい
            // -a-b-c+(ab)+(bc)+(ca)-(abc)
            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            long c = in.nextLong();

            long res =
                    +(n / a) + (n / b) + (n / c)
                            - (n / Arith.lcm(a, b))
                            - (n / Arith.lcm(b, c))
                            - (n / Arith.lcm(c, a))
                            + (n / Arith.lcm(Arith.lcm(a, b), c));
            out.println(res);

        }

    }

    static class Arith {
        public static long gcd(long a, long b) {
            return a % b == 0 ? b : gcd(b, a % b);
        }

        public static long lcm(long a, long b) {
            return a / gcd(a, b) * b;
        }

    }
}