import java.util.Scanner;
public class Main{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.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)));
	}

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

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