#include <iostream>

using namespace std;

using ull = unsigned long long int;

bool judge(ull, ull, ull, ull);
ull sum(ull, ull, ull, ull);

int main()
{
	ull n, a, b, c;
	cin >> n;
	cin >> a >> b >> c;
	std::cout << sum(n, a, b, c) << std::endl;

	return 0;
}

bool judge(ull num, ull a, ull b, ull c){
	return !(num%a) || !(num%b) || !(num%c);
}

ull sum(ull n, ull a, ull b, ull c){
	ull current = 1,
		ans = 0;
	
	while(current <= n){
		if(judge(current,a,b,c)){
			ans++;
		}
		current++;
	}
	return ans;
}