#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

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