#include <iostream>
using namespace std;

int gcd(int a, int b) {
	return b ? gcd(b, a % b) : a;
	}
int lcm(int a, int b) {
	return a / gcd(a, b) * b;
	}
int count(int n, int x) {
	return n / x;
	}

int main() {
    int n, a, b, c;
    cin >> n >> a >> b >> c;
    int ab = lcm(a, b), bc = lcm(b, c), ac = lcm(a, c), abc = lcm(ab, c);
    cout << (count(n, a) + count(n, b) + count(n, c)) 
         - (count(n, ab) + count(n, bc) + count(n, ac)) 
         + count(n, abc) << endl;
}