import math._

object Main {
  def gcd(n: Long, m: Long): Long =
    if (m == 0) n else gcd(m, n % m)

  def lcm(n: Long, m: Long): Long =
    n * m / gcd(n, m)

  def main(args: Array[String]) {
    val sc = new java.util.Scanner(System.in)
    val n, a, b, c = sc.nextLong

    val x = n/a + n/b + n/c
    val y = n/lcm(a, b) + n/lcm(b, c) + n/lcm(c, a)
    val z = n/lcm(a, lcm(b, c))
    val ans = x - y + z
    println(ans)
  }
}