import java.util.*;

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

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