import java.util.Scanner;

public class Main {
	
	public static long gcd(final long a, final long b){
		return b == 0 ? a : gcd(b, a % b);
	}
	
	public static long lcm(final long a, final long b){
		return a / gcd(a, b) * b;
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		final long a = sc.nextInt();
		final long b = sc.nextInt();
		final long c = sc.nextInt();
		
		System.out.println((N / a) + (N / b) + (N / c) - (N / lcm(a, b)) - (N / lcm(b, c)) - (N / lcm(c, a)) + (N / lcm(a, lcm(b, c))));
	}

}