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

long long gcd(long long a, long long b){return b?gcd(b,a%b):a;}

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

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

  ab = gcd(a,b);
  bc = gcd(b,c);
  ca = gcd(c,a);

  cout<<(N/a+N/b+N/c-N/(a*b/ab)-N/(b*c/bc)-N/(c*a/ca)+N/(c*a*b/(ab)/__gcd(a*b/(ab),c)))<<endl;
  
  return 0;
}