#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<(b);++i)
#define erep(i,a,b) for(int i=a;i<=(int)(b);++i)
#define per(i,a,b) for(int i=(a);i>(b);--i)
#define eper(i,a,b) for(int i=(a);i>=b;--i)
#define pb push_back
#define mp make_pair
#define INF 100100100100
#define MOD 1000000007
#define ALL(x) begin(x),end(x)
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using vii = vector<int>;
using vll = vector<ll>;
template<class T>using vv = vector<T>;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
int dy[]={0, 0, 1, -1};
int dx[]={1, -1, 0, 0};
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a, b)*b;}
ll n, a, b, c;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
    cin >> n >> a >> b >> c;
    ll A = n / a, B = n / b, C = n / c, AB = n / lcm(a, b), BC = n / lcm(b, c), CA = n / lcm(c, a), ABC = n / lcm(a, lcm(b, c));
    ll ans = A + B + C - AB - BC - CA + ABC;
    cout << ans << endl;
    return 0;
}