#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll gcd(ll n, ll m) {
	if (n < m) {
		ll c = n;
		n = m;
		m = c;
	}
	if (n%m == 0) {
		return m;
	}
	else {
		return gcd(m, n%m);
	}
}
int main() {
	ll n, a, b, c;
	cin >> n >> a >> b >> c;
	ll ans = 0;
	ans += n / a + n / b + n / c;
	ll ab = a * b / gcd(a, b);
	ll bc = b * c / gcd(b, c);
	ll ca = c * a / gcd(c, a);
	ans -= n / ab + n / bc + n / ca;
	ll abc = a * bc / gcd(a, bc);
	ans += n / abc;
	cout << ans << endl;

	return 0;
}