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

int n,a,b,c;

int main()
{
    cin >> n >> a >> b >> c;

    int na = n / a,nb = n / b,nc = n / c;
    int nac = n / (a * c),nab = n / (a * b),nbc = n / (b * c);
    int nabc = n / (a * b * c);
    if(b % a == 0 && c % a == 0) cout << na;
    else if(b % a == 0) cout << na + nc - nac;
    else if(c % a == 0) cout << na + nb - nab;
    else cout << na + nb + nc - (nac + nab + nbc) + nabc;
    cout << endl; 

    return 0;
}