package main

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

var sc = bufio.NewScanner(os.Stdin)
var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func main() {
	sc.Split(bufio.ScanWords)
	n := nextInt64()
	a, b, c := nextInt64(), nextInt64(), nextInt64()
	ret := int64(0)

	ret += n / a
	ret += n / b
	ret -= n / lcm(a, b)
	ret += n / c
	ac := lcm(a, c)
	bc := lcm(b, c)
	ret -= n / ac
	ret -= n / bc
	ret += n / lcm(ac, bc)
	fmt.Println(ret)
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextInt64() int64 {
	i, _ := strconv.ParseInt(nextLine(), 10, 64)
	return i
}

func nextUint64() uint64 {
	i, _ := strconv.ParseUint(nextLine(), 10, 64)
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}

func factor(n int64) []int64 {
	if n <= 1 {
		return []int64{n}
	}

	ps := make([]int64, 0, 100)

	for i := int64(2); i*i <= n; i++ {
		for n%i == 0 {
			n /= i
			ps = append(ps, i)
		}
	}
	if n > 1 {
		ps = append(ps, n)
	}
	return ps
}

func gcd(a, b int64) int64 {
	for ; b != 0; b, a = a%b, b {
	}
	return a
}

func lcm(a, b int64) int64 {
	return (a * b) / gcd(a, b)
}