import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long n = sc.nextLong();
    long a = sc.nextLong();
    long b = sc.nextLong();
    long c = sc.nextLong();
    long k1 = n / a;
    long k2 = n / b;
    long k3 = n / c;
    long g1 = gcd(a, b);
    long g2 = gcd(a, c);
    long g3 = gcd(b, c);
    long g4 = gcd(a, g3);
    long l1 = g1 * (a / g1) * (b / g1);
    long l2 = g2 * (a / g2) * (c / g2);
    long l3 = g3 * (b / g3) * (c / g3);
    long g5 = gcd(l1, c);
    long l4 = g5 * (l1 / g5) * (c / g5);
    long h1 = n / l1;
    long h2 = n / l2;
    long h3 = n / l3;
    long h4 = n / l4;
    long ans = k1 + k2 + k3 - h1 - h2 - h3 + h4;
    System.out.println(ans);
  }

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