#include <bits/stdc++.h>
#define ll long long
#define INF 1000000005
#define MOD 1000000007
#define EPS 1e-10
#define rep(i,n) for(int i=0;i<(int)n;++i)
#define each(a, b) for(auto (a): (b))
#define all(v) (v).begin(),(v).end()
#define fi first
#define se second
#define pb push_back
#define show(x) cout <<#x<<" = "<<(x)<<endl
#define spair(p) cout <<#p<<": "<<p.fi<<" "<<p.se<<endl
#define svec(v) cout<<#v<<":";rep(kbrni,v.size())cout<<" "<<v[kbrni];cout<<endl
#define sset(s) cout<<#s<<":";each(kbrni,s)cout <<" "<<kbrni;cout<<endl

using namespace std;

typedef pair<int,int>P;

const int MAX_N = 100005;

int gcd(int a,int b)
{
    if(a % b == 0){
        return b;
    }else{
        return gcd(b,a%b);
    }
}

int main()
{
    ll n;
    cin >> n;
    int a,b,c;
    cin >> a >> b >> c;
    ll ans = 0;
    ans += n / a + n / b + n / c;
    ans -= n*gcd(a,b) / (a*b) + n*gcd(b,c) / (b*c) + n*gcd(c,a) / (c*a);
    ll b1 = a*b / gcd(a,b);
    ans += n*gcd(b1,c) / (b1*c);
    cout << ans << endl;
    return 0;
}