import java.util.Scanner;
public class Main {
	static long gcd(long a, long b) {
		if(b == 0) return a;
		return gcd(b, a%b);
	}
	static long lcm(long a, long b) {
		long g = gcd(a, b);
		return a / g * b;
	}
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long n = Long.parseLong(sc.next());
		long a = Long.parseLong(sc.next());
		long b = Long.parseLong(sc.next());
		long c = Long.parseLong(sc.next());
		long d = lcm(a, b);
		long e = lcm(b, c);
		long f = lcm(c, a);
		long g = lcm(d, c);
		System.out.println(n/a + n/b + n/c + n/g - n/d - n/e - n/f);
	}
}