import java.util.Scanner

object Main extends App {

  def gcd(a: Long, b: Long): Long = if (b == 0) a.abs else gcd(b, a % b)

  def lcm(a: Long, b: Long) = (a * b).abs / gcd(a, b)

  def proc(n: Long, a: Long, b: Long, c: Long): Int = {
    val ab = lcm(a, b)
    val ac = lcm(a, c)
    val bc = lcm(b, c)
    val abc = lcm(a, bc)

    (n / a + n / b + n / c - n / ab - n / ac - n / bc + n / abc).toInt
  }

  def blute(n: Int, a: Int, b: Int, c: Int): Int = {
    (1 to n).count { x =>
      x % a == 0 || x % b == 0 || x % c == 0
    }
  }

  val sc = new Scanner(System.in)
  val n = sc.nextInt()
  val a = sc.nextInt()
  val b = sc.nextInt()
  val c = sc.nextInt()

  val result = proc(n, a, b, c)
  println(result)
}