import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextInt();
		long a = sc.nextInt();
		long b = sc.nextInt();
		long c = sc.nextInt();
		long ans = n / a + n / b + n / c - n / lcm(a, b) - n / lcm(b, c) - n / lcm(c, a) + n / lcm(lcm(a, b), c);
		System.out.println(ans);
	}
	
	static long lcm(long x, long y) {
	    return x / gcd(x, y) * y;
	}
	
	static long gcd(long x, long y) {
	    if (x % y == 0) {
	        return y;
	    } else {
	        return gcd(y, x % y);
	    }
	}
}