#include <iostream>
#include <cstdio>

using namespace std;

long long gcd(long long a, long long b) {
	return b == 0 ? a : gcd(b, a % b);
}

long long lcm(long long a, long long b) {
	return a / gcd(a, b) * b;
}

int main() {
	long long n, a, b, c;

	cin >> n >> a >> b >> c;

	long long ans = n / a + n / b + n / c;
	ans -= n / lcm(a, b) + n / lcm(b, c) + n / lcm(c, a);
	ans += n / lcm(a, lcm(b, c));

	cout << ans << endl;
	return 0;
}