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 {
	if a < b {
		a, b = b, a
	}
	if b == 0 {
		return a
	} else {
		return gcd(b, a%b)
	}
}

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