package main

import (
	"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() {
	var N int
	var a, b, c int

	fmt.Scanf("%d", &N)
	_, 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)
}