#include<iostream>
#include<algorithm>
using namespace std;

int main(){
  long long  a, b, c, N;

  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/(c*a*b/(__gcd(a,b))/__gcd(a*b/(__gcd(a,b)),c)))<<endl;
  
  return 0;
}