#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;

int ans = n/a + n/b + n/c;
int lcmab = (a*b)/__gcd(a,b);
int lcmac = (a*c)/__gcd(a,c);
int lcmbc = (c*b)/__gcd(c,b);


ans -= n/(lcmab);
ans -= n/(lcmac);
ans -= n/(lcmbc);
int lcm = (c*lcmab)/__gcd(c,lcmab);

cout<< ans + n/lcm ;
}



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

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