#include<iostream>
using namespace std;
long gcd(long a,long b){return b?gcd(b,a%b):a;}
long n,a,b,c;
main()
{
	cin>>n>>a>>b>>c;
	cout<<(n/a+n/b+n/c-n/(a*b/gcd(a,b))-n/(b*c/gcd(b,c))-n/(c*a/gcd(c,a))+n/(a*b/gcd(a,b)*c/gcd(a*b/gcd(a,b),c)))<<endl;
}