#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
ll gcd(ll n, ll m){return m?gcd(m,n%m):n;}
ll lcm(ll n, ll m){return n/gcd(n,m)*m;}
int main(){
    ll N,a,b,c; cin >> N >> a >> b >> c;
    cout << N/a+N/b+N/c-N/lcm(a,b)-N/lcm(b,c)-N/lcm(a,c)+N/lcm(lcm(a,b),c) << endl;
}