#include <iostream>
using namespace std;
long long int gcd (long long int a,long long int b )
{
  long long int c;
  while ( a != 0 ) {
     c = a; a = b%a;  b = c;
  }
  return b;
}


int main() {
	// your code goes here
	long long int n,a,b,c,ans=0;
	std::cin>>n>>a>>b>>c;
	ans=n/a+n/b+n/c;
	ans-=n/(a*b/gcd(a,b));
	ans-=n/(a*c/gcd(a,c));
	ans-=n/(b*c/gcd(b,c));
	long long int d=a*b/gcd(a,b);
	ans+=n/(d*c/gcd(d,c));
	std::cout<<ans<<"\n";
	return 0;
}