#include <bits/stdc++.h>
using namespace std;

#define vi vector<int>
#define vs vector<string>
#define int long long int
#define pii pair<int,int>
#define pb push_back
#define f(i,a,b) for(int i=a;i<b;i++)
#define ff first
#define s second
#define nl cout<<endl;
#define print(a) cout<<a<<"\n";
#define all(a) (a).begin(), (a).end()
#define parr(a) f(mnb,0,a.size()){cout<<a[mnb]<<" ";}cout<<endl;
#define rarr(a) f(yon,0,a.size()){cin>>a[yon];}
#define imx INT_MAX
#define imn INT_MIN
#define sortD(a) sort(a.end(),a.begin());
#define sortA(a) sort(all(a));



void solve(){
int n; cin >> n;
int a, b, c; cin >> a >>b >> c;

set<int> st;
for(int i = 1; a*i <= n; i++){
    st.insert(a*i);
}
for(int i = 1; b*i <= n; i++){
    st.insert(b*i);
}
for(int i = 1; c*i <= n; i++){
    st.insert(c*i);
}
cout << st.size();
}



signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int t=1;
		//cin>>t;
	while(t--){
		solve();
	}
}