#include <iostream>

using namespace std;

int main()
{
    int k, l, m, n, d, count = 0;
    cin >> k >> l >> m >> n >> d;
    for (int i = 1; i <= d; i++)
    {
        if ((i%k == 0) || (i%l == 0) || (i%m == 0) || (i%n == 0))
        {
            count++;
        }
    }
    cout << count;
    return 0;
}