import java.util.Scanner;

public class Main {
    public static void main(String[] p) {
        Scanner q = new Scanner(System.in);
        long n = q.nextLong();
        int a = q.nextInt();
        int b = q.nextInt();
        int c = q.nextInt();

        int ab = lcm(a, b);
        int bc = lcm(b, c);
        int ca = lcm(c, a);
        int abc = lcm(ab, c);

        System.out.println((n / a + n / b + n / c) - (n / ab + n / bc + n / ca - n / abc));
    }

    private static int lcm(int a, int b) {
        int min = Math.min(a, b);
        int last = 0;
        for (int r = Math.max(a, b); r != 0;) {
            last = r;
            r = Math.abs(min - r);
            min = Math.min(min, last);
        }
        return a * b / last;
    }
}