package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

const MOD = 1e9 + 7
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)
}

func main() {
	N := nextInt()
	var a, b, c int
	_, err := fmt.Scanf("%d %d %d", &a, &b, &c)
	if err != nil {
		panic(err)
	}
	ans := (N / a) + (N / b) + (N / c)
	ans -= N / lcm(a, b)
	ans -= N / lcm(b, c)
	ans -= N / lcm(a, c)
	ans += N / lcm(lcm(a, b), c)
	fmt.Println(ans)
}

var s = bufio.NewScanner(os.Stdin)

func next() string {
	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}
func nextLine() string {
	s.Split(bufio.ScanLines)
	s.Scan()
	return s.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}
func nextLong() int64 {
	i, e := strconv.ParseInt(next(), 10, 64)
	if e != nil {
		panic(e)
	}
	return i
}


func min(a int, b int) int {
	if a < b {
		return a
	}
	return b
}
func max(a int, b int) int {
	if a < b {
		return b
	}
	return a
}