#include <iostream>
using namespace std;
typedef long long LL;
int main(int argc, char* argv[])
{
	LL N,a,b,c;
	cin>>N;
	cin>>a>>b>>c;
	if (a==b && b==c){
		cout<<N/a<<endl;
		return 0;
	}
	LL aw=0;
	LL X=0;
	while (X<N){
		X+=a;
		if (X<=N){
			aw++;
		}
	}
	X=0;
	while (X<N){
		if (a==b){
			break;
		}
		X+=b;
		if (X<=N && X%a!=0){
			aw++;
		}
	}
	X=0;
	while (X<N){
		if (a==c || b==c){
			break;
		}
		X+=c;
		if (X<=N && X%a!=0 && X%b!=0){
			aw++;
		}
	}

	cout<<aw<<endl;
	return 0;
}