#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n);i++)
#define sz(x) int(x.size())
typedef unsigned long long ll;
typedef long double ld;
typedef pair<int,int> P;
constexpr int mod = 1e9+7;

int main() {
  ll n, a, b, c;
  cin >> n >> a >> b >> c;
  ll res = n / a + n / b + n / c;
  ll lcm = a / gcd(a, b) * b;
  res -= n / lcm;
  res -= n / (a / gcd(a, c) * c);
  res -= n / (b / gcd(b, c) * c);
  lcm = lcm / gcd(lcm, c) * c;
  cout << res + (n / lcm) << endl;
  return 0;
}