#include<iostream>

using namespace std;

long long gcd(long long a,long long b){
	if(a<b) return gcd(b,a);
	if(b==0) return a;
	return gcd(b,a%b);
}

int main(){

	long long N;
	long long a,b,c;

	long long Na,Nb,Nc;
	long long ab,bc,ac;
	long long Nab,Nbc,Nac;
	long long abc;
	long long Nabc;

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

	Na=N/a;
	Nb=N/b;
	Nc=N/c;

	ab=a*b/gcd(a,b);
	bc=b*c/gcd(b,c);
	ac=a*c/gcd(a,c);

	Nac=N/ac;
	Nab=N/ab;
	Nbc=N/bc;

	abc=ab*c/gcd(ab,c);

	Nabc=N/abc;

	cout<<Na+Nb+Nc-Nab-Nbc-Nac+Nabc<<endl;
}