#include<bits/stdc++.h>
using namespace std;
int main(){
  long long n,a,b,c;
  cin >> n >> a >> b >> c;
  cout << n/a+n/b+n/c-n/(a*b/__gcd(a,b))-n/(a*c/__gcd(a,c))-n/(b*c/__gcd(b,c))+n/(a*b*c/__gcd(a,b*c/__gcd(b,c)))<< endl;
  return 0;
}