import java.util.Scanner;

public class Test {
	public static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) {
		long n = sc.nextLong(), a = sc.nextLong(), b = sc.nextLong(), c = sc.nextLong(), cnt = 0;
		cnt += n / a;
		cnt += n / b;
		cnt += n / c;
		cnt -= n / (lcm(a, b));
		cnt -= n / (lcm(a, c));
		cnt -= n / (lcm(b, c));
		cnt += n / (lcm(a, lcm(b, c)));
		System.out.println(cnt);
	}

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

	public static long gcd(long a, long b) {
		long tmp = a % b;
		while (tmp > 0) {
			a = b;
			b = tmp;
			tmp = a % b;
		}
		return b;
	}
}