import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		long N = scan.nextInt();
		long a = scan.nextInt();
		long b = scan.nextInt();
		long c = scan.nextInt();
		scan.close();
		if(b % a == 0 && c % a == 0) {
			long ans = N / a;
			System.out.println(ans);
		}else if(b % a == 0) {
			long k1 = N / a;
			long k2 = N / c;
			long k3 = N / lcm(a, c);
			long ans = k1 + k2 - k3;
			System.out.println(ans);
		}else if(c % a == 0) {
			long k1 = N / a;
			long k2 = N / b;
			long k3 = N / (a * b);
			long ans = k1 + k2 - k3;
			System.out.println(ans);
		}else {
			long k1 = N / a;
			long k2 = N / b;
			long k3 = N / c;
			long k4 = N / lcm(a, b);
			long k5 = N / lcm(b, c);
			long k6 = N / lcm(c, a);
			long k7 = N / lcm(lcm(a, b), c);
			long ans = k1 + k2 + k3 - (k4 + k5 + k6) + k7;
			System.out.println(ans);
		}
	}
	static long gcd(long m, long n) {
		if(m < n) {
			return gcd(n , m);
		}
		if(n == 0) {
			return m;
		}
		return gcd(n, m % n);
	}
	static long lcm(long m, long n) {
		return m * n / gcd(m, n);
	}
}