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