#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
typedef long long ll;
ll lcm3(ll a,ll b,ll c) {
    ll k=a/__gcd(a,b)*b;
    return c/__gcd(c,k)*k;
}
int main() {
    //freopen("multiple.in","r",stdin);
    //freopen("multiple.out","w",stdout);
    ll n,a,b,c; cin>>n>>a>>b>>c;
    cout<<n/a+n/b+n/c-n/(a/__gcd(a,b)*b)-n/(a/__gcd(a,c)*c)-n/(b/__gcd(b,c)*c)+n/lcm3(a,b,c);
    return 0;
}