import java.io.*;
import java.util.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static long gcd (long a , long b) {
		if (a < b) {
			long tmp = a;
			a = b;
			b = tmp;
		}
		if (b == 0) return a;
		return gcd(b , a % b);
	}
	
	public static long solve (int n , int a , int b , int c) {
		long d = a * b / gcd(a , b);
		long e = b * c / gcd(b , c);
		long f = c * a / gcd(c , a);
		long g = c * d / gcd(c , d);
		return n / a + n / b + n / c - (n / d + n / e + n / f) + n / g;
	}
	
	public static void main (String[] args) throws IOException {
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		
		out(solve(n,a,b,c));
	}
}