package main

import (
	"fmt"
)

func main() {
	var n, a, b, c int
	fmt.Scan(&n, &a, &b, &c)
	na := n / a
	nb := n / b
	nc := n / c
	nab := n / lcm(a, b)
	nac := n / lcm(a, c)
	nbc := n / lcm(b, c)
	nabc := n / lcm(a, lcm(b, c))
	fmt.Println(na + nb + nc - nab - nac - nbc + nabc)
}

func gcd(a, b int) int {
	for b != 0 {
		a, b = b, a % b
	}
	return a
}

func lcm(a, b int) int {
	return a * b / gcd(a, b)
}