#include <iostream>
using namespace std;

int main() {
	int n, a, b, c;
	cin >> n >> a >> b >> c;
	int count = 0;
	for(int i = 1; i <= n; i++) {
		if(i % a == 0 || i % b == 0 || i % c == 0) count++;
	}
	cout << count << endl;
	return 0;
}