#include <iostream>
using namespace std;

int countMultiples(int a, int b, int c, int N)
{
    int count = 0;
    for (int i = 1; i <= N; ++i)
    {
        if (i % a == 0 || i % b == 0 || i % c == 0)
        {
            ++count;
        }
    }
    return count;
}

int main()
{
    int N;
    cin >> N;

    int num1, num2, num3;
    cin >> num1 >> num2 >> num3;

    int result = countMultiples(num1, num2, num3, N);

    cout << result << endl;

    return 0;
}