#include <bits/stdc++.h>


using namespace std;
typedef long long ll;
#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define VB vector<bool>
#define VVB vector<vector<bool>>
#define fore(i,a) for(auto &i:a)

typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 1 << 30;
const ll INFL = 1LL<<60;
const ll mod =1000000007;

ll gcd(ll x, ll y) {
	if (y == 0) return x;
	return gcd(y, x%y);
}

ll lcm(ll x, ll y) {
	return x * y / gcd(x, y);
}

int main() {
	
	ll n, a, b, c;
	cin >> n >> a >> b >> c;
	ll ans = (n / a) + (n / b) + (n / c);
	ans -= (n / lcm(a,b)) + (n / lcm(b,c)) + (n / lcm(c,a));
	ans += n / lcm(a, lcm(b, c));

	cout << ans << endl;
}