#include <bits/stdc++.h>
using namespace std;

int main()
{
    long long int n = 0;
    cin >> n;
    int a = 0, b = 0, c = 0;
    cin >> a >> b >> c;
    set<int> ans;
    int i = 1;
    while(a*i <=n){
        ans.insert(a*i);
        i++;
    }
    i = 1;
    while (b * i <= n)
    {
        ans.insert(b * i);
        i++;
    }
    i = 1;
    while (c * i <= n)
    {
        ans.insert(c * i);
        i++;
    }
    cout << ans.size() << endl;
}