#include <iostream>

long long gcd(long long m, long long n)
{
	if (m < n) return gcd(n, m);
	if (n == 0) return m;
	return gcd(n, m % n);
}

long long lcm(long long m, long long n)
{
	return m * n / gcd(m, n);
}

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