#include <bits/stdc++.h>

using namespace std;

#define ll long long

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

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

int main() {
	ll n; cin >> n;
	ll a, b, c; cin >> a >> b >> c;
	ll res = 0;
	res += n / a; res += n / b; res += n / c;
	res -= n / lcm(a, b);
	res -= n / lcm(b, c);
	res -= n / lcm(c, a);
	res += n / lcm(a, lcm(b, c));
	cout << res << endl;
	return 0;
}