#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vi;
typedef pair<ll,ll> pi;
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define popcount __builtin_popcountll
#define forn(i,a,b) for (ll i = a; i < b; i++)

void solve(){
    ll N;cin>>N;
    ll a,b,c;cin>>a>>b>>c;
    ll n1=(a*b)/__gcd(a,b);
    ll n2=(a*c)/__gcd(a,c);
    ll n3=(c*b)/__gcd(c,b);
    ll n4=(n1*c)/__gcd(n1,c);
    cout<<(N/a)+(N/b)+(N/c)-(N/n1)-(N/n2)-(N/n3)+(N/n4);
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    ll t=1;
    // cin >> t;
    forn(i,0,t){
        solve();
    }
}