#include <iostream>
#include <unordered_set>
using namespace std;

int main() {
    int N;
    cin >> N;  

    int a, b, c;
    cin >> a >> b >> c;

    unordered_set<int> multiples;  

    for (int x = a; x <= N; x += a) {
        multiples.insert(x);
    }

    
    for (int y = b; y <= N; y += b) {
        multiples.insert(y);
    }
    for (int z = c; z <= N; z += c) {
        multiples.insert(z);
    }

    
    cout << multiples.size() << endl;

    return 0;
}