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

int main()
{
    long n, a, b, c;
    while (cin>>n>>a>>b>>c) {
        long x=a*b/__gcd(a, b);
        long y=b*c/__gcd(b, c);
        long z=c*a/__gcd(c, a);
        long w=x*c/__gcd(x, c);

        cout<<(n/a+n/b+n/c-n/x-n/y-n/z+n/w)<<endl;
    }
}