import java.util.*;

public class Yuki316 {
    public static void main(String[] args) {
        long N;
        int a;
        int b;
        int c;
        try (Scanner sc = new Scanner(System.in)) {
            N = sc.nextLong();
            a = sc.nextInt();
            b = sc.nextInt();
            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)));
    }

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

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