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

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

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

int main() {
	long long n, a, b, c;
	cin >> n >> a >> b >> c;
	cout << n / a + n / b + n / c - n / lcm(a, b) - n / lcm(a, c) - n / lcm(b, c) + n / lcm(a, lcm(b, c)) << endl;
}