#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
using namespace std;

using ll = long long;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll N, a, b, c;
    cin >> N >> a >> b >> c;
    ll ans = N / a + N / b + N / c;
    ans -= N / (a * b / gcd(a, b));
    ans -= N / (b * c / gcd(b, c));
    ans -= N / (c * a / gcd(c, a));
    ll lcm = a * b / gcd(a, b);
    lcm = lcm / gcd(lcm, c) * c;
    ans += N / lcm;
    cout << ans << '\n';

    return 0;
}