#include <bits/stdc++.h>

using namespace std;

struct Initializer {
  Initializer() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout << fixed << setprecision(15);
  }
} initializer;

template<typename T> inline istream& operator>>(istream &s, vector<T> &v) {
  for (T &t : v) s >> t;
  return s;
}

template<typename T> inline ostream& operator<<(ostream &s, const vector<T> &v) {
  for (const T &t : v) s << t << endl;
  return s;
}

template<typename T> inline T min(vector<T>& v) {return *min_element(v.begin(), v.end());}

template<typename T> inline T max(vector<T>& v) {return *max_element(v.begin(), v.end());}

template<typename T> inline int min_element(vector<T>& v) {return min_element(v.begin(), v.end()) - v.begin();}

template<typename T> inline int max_element(vector<T>& v) {return max_element(v.begin(), v.end()) - v.begin();}

template<typename T> inline void sort(vector<T>& v) {sort(v.begin(), v.end());}

template<typename T, typename Function> inline void sort(vector<T>& v, Function func) {sort(v.begin(), v.end(), func);}

template<typename T> inline void rsort(vector<T>& v) {sort(v.rbegin(), v.rend());}

template<typename T> inline void reverse(vector<T>& v) {reverse(v.begin(), v.end());}

template<typename T> inline void unique(vector<T>& v) {v.erase(unique(v.begin(), v.end()), v.end());}

template<typename T> inline void nth_element(vector<T>& v, int n) {nth_element(v.begin(), v.begin() + n, v.end());}

template<typename T> inline bool next_permutation(vector<T>& v) {return next_permutation(v.begin(), v.end());}

template<typename T> inline int find(vector<T>& v, T t) {return find(v.begin(), v.end(), t) - v.begin();}

template<typename T> inline int in(vector<T> v, T t) {return find(v, t) != (int)v.size();}

template<typename T> inline int lower_bound(vector<T>& v, T t) {return lower_bound(v.begin(), v.end(), t) - v.begin();}

template<typename T> inline int upper_bound(vector<T>& v, T t) {return upper_bound(v.begin(), v.end(), t) - v.begin();}

template<typename T> inline T accumulate(const vector<T>& v, function<T(T, T)> func = plus<T>()) {return accumulate(v.begin(), v.end(), T(), func);}

template<typename T> inline void adjacent_difference(vector<T>& v) {adjacent_difference(v.begin(), v.end(), v.begin());}

template<typename T> inline void adjacent_difference(vector<T>& v, vector<T>& u) {adjacent_difference(v.begin(), v.end(), u.begin());}

template<typename T> inline void partial_sum(vector<T>& v, vector<T>& u) {partial_sum(v.begin(), v.end(), u.begin());}

template<typename T> inline T inner_product(vector<T>& v, vector<T>& u) {return inner_product(v.begin(), v.end(), u.begin(), T(0));}

template<typename T> inline int count(const vector<T>& v, T t) {return count(v.begin(), v.end(), t);}

template<typename T, typename Function> inline int count_if(const vector<T>& v, Function func) {return count_if(v.begin(), v.end(), func);}

template<typename T, typename Function> inline void remove_if(vector<T>& v, Function func) {v.erase(remove_if(v.begin(), v.end(), func), v.end());}

template<typename T, typename Function> inline bool any_of(vector<T> v, Function func) {return any_of(v.begin(), v.end(), func);}

template<typename T> inline vector<T> subvector(vector<T>& v, int a, int b) {return vector<T>(v.begin() + a, v.begin() + b);}

template<typename T> inline int kinds(const vector<T>& v) {return set<T>(v.begin(), v.end()).size();}

template<typename T> inline T gcd(T t) {
  return t;
}

template<typename T, typename... S> inline T gcd(T t, S... s) {
  return __gcd(t, gcd(s...));
}

template<typename T> inline T lcm(T t) {
  return t;
}

template<typename T, typename... S> inline T lcm(T t, S... s) {
  T l = lcm(s...);
  return t / gcd(t, l) * l;
}

template<typename T> inline T floor(T a, T b) {
  return a / b * b <= a ? a / b : a / b - 1;
}

template<> inline float floor(float a, float b) {
  return floor(a / b) * b <= a ? floor(a / b) : floor(a / b) - 1;
}

template<> inline double floor(double a, double b) {
  return floor(a / b) * b <= a ? floor(a / b) : floor(a / b) - 1;
}

template<> inline long double floor(long double a, long double b) {
  return floor(a / b) * b <= a ? floor(a / b) : floor(a / b) - 1;
}

template<typename T> inline T ceil(T a, T b) {
  return floor(a + b - 1, b);
}

template<typename T> inline T round(T a, T b) {
  return floor(a + b / 2);
}

template<typename T> inline T mod(T a, T b) {
  return a - floor(a, b) * b;
}

template<typename T> inline T factorial(T n) {
  return n <= 1 ? 1 : factorial(n - 1) * n;
}

template<typename T> inline T square(T n) {
  return n * n;
}

template<typename T> inline T cube(T n) {
  return n * n * n;
}

template<typename T> inline T norm(T x1, T y1, T x2, T y2) {
  return square(x1 - x2) + square(y1 - y2);
}

inline long long sqrt(long long n) {
  return sqrt((long double)n);
}

int main() {
  int n, res = 0;
  vector<int64_t> a(3);
  cin >> n >> a;
  for (int i : a) res += n / i;
  for (int i = 0; i < 3; ++i) res -= n / lcm(a[i], a[(i + 1) % 3]);
  cout << res + n / lcm(a[0], a[1], a[2]) << endl;
}