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

long long gcd(long long a, long long b)
{
    while (b != 0)
    {
        long long temp = b;
        b = a % b;
        a = temp;
    }
    return a;
}

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

int main()
{
    long long int n = 0;
    cin >> n;
    int a = 0, b = 0, c = 0;
    cin >> a >> b >> c;
    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));

    long long result = countA + countB + countC - countAB - countAC - countBC + countABC;
    cout << result << endl;
}