#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
using namespace std;
typedef long long ll;

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

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	ll N, a, b, c;
	cin >> N >> a >> b >> c;

	ll ans = 0;
	ans += N / a + N / b + N / c;
	ans -= N / (a * b / gcd(a, b)) + N / (b * c / gcd(b, c)) + N / (c * a / gcd(c, a));
	ll d = a * b / gcd(a, b);
	ans += N / (c * d / gcd(c, d));

	cout << ans << endl;
}