#include <iostream>

using namespace std;

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