import java.util.*;

public class Exercise58{
  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 count = 0;

    count += n / a;
    count += n / b;
    count += n / c;

    long lcmAB = getLcm(b, a);
    count -= n / lcmAB;

    long lcmBC = getLcm(c, b);
    count -= n / lcmBC;

    long lcmAC = getLcm(c, a);
    count -= n / lcmAC;

    long lcmAll = getLcm(lcmBC, a);
    count += n / lcmAll;

    System.out.println(count);
    
  }
  private static long ea(long biggerNum, long smallerNum){
    long mod = biggerNum % smallerNum;
    if (mod == 0){
      return smallerNum;
    } else {
      return ea(smallerNum, mod);
    }
  }
  private static long getLcm(long biggerNum, long smallerNum){
    long gcm = ea(biggerNum, smallerNum);
    long lcm = biggerNum * smallerNum / gcm;
    return lcm;
  }
}