#include <iostream>
#include <string>
#include <vector>

using namespace std;



int main() {
	int n;
	int count = 0;
	vector<int> v;
	string temp;
	cin >> n;
	for (int i = 0; i < 2 ;i++) {
		getline(cin, temp, ' ');
		v.push_back(stoi(temp));
	}
	getline(cin, temp);
	v.push_back(stoi(temp));
	for (int i = 1; i <= n; i++) {
		if (i % v[0] == 0) count++;
		else if (i % v[1] == 0) count++;
		else if (i % v[2] == 0) count++;
	}
	cout << count;

}