#include <iostream>
#include <vector>
using namespace std;
using ll = long long;

ll mygcd(ll a, ll b){
    while(b != 0){
        ll r = a%b;
        a = b; b = r;
    }
    return a;
}

int main(){
    ll n; cin >> n;
    vector<ll> v(3);
    for(auto &it: v) cin >> it;

    ll ans = 0;
    for(int bit = 1; bit < (1 << 3); bit++){
        ll m = 1;
        int cnt = 0;
        for(int i = 0; i < 3; i++){
            if((bit >> i) & 1){
                m *= v[i]/mygcd(m, v[i]);
                cnt++;
            }
        }
        // cerr << m << " " << cnt << endl;
        if(cnt%2 == 0) ans -= n/m;
        else ans += n/m;
    }
    cout << ans << endl;
    return 0;
}