#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  ll N; cin >> N;
  ll A, B, C; cin >> A >> B >> C;
  ll D = A/__gcd(A,B)*B;
  ll E = B/__gcd(B,C)*C;
  ll F = C/__gcd(C,A)*A;
  ll G = E/__gcd(E,F)*F;
  ll ans = N/A + N/B + N/C - N/D - N/E - N/F + N/G;
  cout << ans << endl;
}