#include<iostream>
#include<algorithm>
using namespace std;
using lint=int64_t;

template<typename T>
T gcd(T a,T b)
{
	if(a==0 || b==0)return 0;
	T r;
	while(1)
	{
		r=a%b;
		if(r==0)break;
		a=b;
		b=r;
	}
	return b;
}

template<typename T>
T lcm(T a,T b)
{
	if(a==0 || b==0)return 0;
	return a*(b/gcd(a,b));
}

int main()
{
	lint N;
	lint a,b,c;

	cin >> N;
	cin >> a >> b >> c;

	cout << N/a+N/b+N/c-N/lcm(a,b)-N/lcm(b,c)-N/lcm(c,a)+N/lcm(a,lcm(b,c)) << endl;
	return 0;
}