#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    auto lcm = [&](ll x, ll y){ return x / __gcd(x, y) * y; };

    ll n,a,b,c; cin >> n >> a >> b >> c;
    ll ans = n / a + n / b + n / c;
    ans -= n / lcm(a, b) + n / lcm(b, c) + n / lcm(c, a);
    ans += n / lcm(a, lcm(b, c));
    cout << ans << endl;
}