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

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long N,a,b,c; cin >> N >> a >> b >> c;
    cout << N/a+N/b+N/c-N/(a*b/gcd(a,b))-N/(b*c/gcd(b,c))-N/(c*a/gcd(c,a))+N/(a*b*c*gcd(gcd(a,b),c)/gcd(a,b)/gcd(b,c)/gcd(c,a)) << endl;
}