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

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	ll N, a, b, c;
	cin >> N >> a >> b >> c;
	ll ans = N / a + N / b + N / c;
	ll lcm = a / __gcd(a, b) * b;
	ans -= N / lcm;
	lcm= b / __gcd(b, c) * c;
	ans -= N / lcm;
	lcm = c / __gcd(c, a) * a;
	ans -= N / lcm;
	lcm = a / __gcd(a, b) * b;
	lcm = lcm / __gcd(lcm, c) * c;
	ans += N / lcm;
	cout << ans << endl;
}