#include <bits/stdc++.h>
#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <sstream>
#include <cmath>
#include <stack>
#include <queue>
#include <cctype>
#include <stdio.h>
#include <map>
#include <string.h>
#include <utility>

typedef long long ll;
using namespace std;

typedef pair<int, int> P;

ll gcd(int a, int b) {
	if (b == 0) {
		return a;
	}

	gcd(b, a % b);
}

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

int main() {

	ll n = 0;
	int anum, bnum, cnum;
	cin >> n >> anum >> bnum >> cnum;

	ll a = n / anum;
	ll b = n / bnum;
	ll c = n / cnum;

	ll ab = n / lcm(anum, bnum);
	ll bc = n / lcm(bnum, cnum);
	ll ca = n / lcm(cnum, anum);

	ll abc = n / lcm(anum, lcm(bnum, cnum));

	cout << a + b + c - ab - bc - ca + abc << endl;

	return 0;
}