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)
	fmt.Println(n/a + n/b + n/c - n/lcm(a,b) - n/lcm(a,c) - n/lcm(b,c) + n/lcm(a,lcm(b,c)))
}

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)
}