#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

const string TARGET_NO = "0316";

template <class T>
T gcd(T a, T b)
{
	return b == 0 ? a : gcd(b, a % b);
}

template <class T>
T lcm(T a, T b)
{
	T g = gcd(a, b);

	return a * b / g;
}

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

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

	ll lab = lcm(a, b),
		lac = lcm(a, c),
		lbc = lcm(b, c),
		l = lcm(lab, c);

	ll res = n / a + n / b + n / c
		- n / lab - n / lac - n / lbc + n / l;

	cout << res << "\n";

	return 0;
}