tailrec fun gcd(a: Long, b: Long): Long = if (b!=0L) gcd(b,a%b) else a
fun lcm(a: Long, b: Long): Long = a/gcd(a,b)*b
fun f(n: Long, a: Long, b: Long, c: Long): Long =
    n/a+n/b+n/c-n/lcm(a,b)-n/lcm(b,c)-n/lcm(c,a)+n/lcm(lcm(a,b),c)

fun main(args: Array<String>) {
    val n = readLine()!!.toLong()
    val (a,b,c) = readLine()!!.split(' ').map(String::toLong)
    println(f(n,a,b,c))
}