#include <bits/stdc++.h>
using namespace std;
#define bokusunny ios::sync_with_stdio(false), cin.tie(nullptr);

void solve() {
  int N;
  cin >> N;
  int a, b, c;
  cin >> a >> b >> c;

  long long ab = lcm(a, b);
  long long bc = lcm(b, c);
  long long ac = lcm(a, c);
  long long abc = lcm(ab, bc);

  int ans = N / a + N / b + N / c - N / ab - N / ac - N / bc + N / abc;
  cout << ans << endl;
}

int main() {
  bokusunny;
  solve();

  return 0;
}