#include<iostream>

using namespace std;

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

int main(){

	long long N,a,b,c;

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

	if(a%b==0||a%c==0) a=N+1;
	if(b%a==0||b%c==0) b=N+1;
	if(c%a==0||c%b==0) c=N+1;
	long long ab=a*b/gcd(a,b),ac=a*c/gcd(a,c),bc=b*c/gcd(b,c),abc=a*b*c/gcd(gcd(a,b),c);
	cout<<N/a+N/b+N/c-N/ab-N/bc-N/ac+N/abc<<endl;
}