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

long long lcm(long long x, long long y)
{
    return (x  * y / __gcd(x, y)) ;
}

long long countMultiples(long long N, long long b, long long c, long long a)
{
    long long countA = N / a;
    long long countB = N / b;
    long long countC = N / c;

    long long countAB = N / lcm(a, b);
    long long countAC = N / lcm(a, c);
    long long countBC = N / lcm(b, c);

    long long countABC = N / lcm(a, lcm(b, c));

    return countA + countB + countC - countAB - countAC - countBC + countABC;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    long long N, a, b, c;
    cin >> N >> a >> b >> c;

    cout << countMultiples(N, b, c, a) << "\n";

    return 0;
}