import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Iterator;


public class Main_yukicoder316 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Printer pr = new Printer(System.out);

        long n = sc.nextInt();
        long a = sc.nextInt();
        long b = sc.nextInt();
        long c = sc.nextInt();

        long ab = lcm(a, b);
        long bc = lcm(b, c);
        long ca = lcm(c, a);
        long abc = lcm(ab, c);

        long ret = n / a + n / b + n / c - n / ab - n / bc - n / ca + n / abc;

        pr.println(ret);

        pr.close();
        sc.close();
    }

	private static long lcm(long n, long m) {
		return n / gcd(n, m) * m;
	}

	private static long gcd(long n, long m) {
		if (m == 0) {
			return n;
		} else {
			return gcd(m, n % m);
		}
	}

	@SuppressWarnings("unused")
	private static class Scanner {
		BufferedReader br;
		Iterator<String> it;

		Scanner (InputStream in) {
			br = new BufferedReader(new InputStreamReader(in));
		}

		String next() throws RuntimeException  {
			try {
				if (it == null || !it.hasNext()) {
					it = Arrays.asList(br.readLine().split(" ")).iterator();
				}
				return it.next();
			} catch (IOException e) {
				throw new IllegalStateException();
			}
		}

		int nextInt() throws RuntimeException {
			return Integer.parseInt(next());
		}

		long nextLong() throws RuntimeException {
			return Long.parseLong(next());
		}

		float nextFloat() throws RuntimeException {
			return Float.parseFloat(next());
		}

		double nextDouble() throws RuntimeException {
			return Double.parseDouble(next());
		}

		void close() {
			try {
				br.close();
			} catch (IOException e) {
//				throw new IllegalStateException();
			}
		}
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}