#include <bits/stdc++.h>

using namespace std;

//难度低
int main() {
    int m, n, k, p;
    cin >> m >> n >> k >> p;
    int count = 0;
    for (int i = 1; i <= p; i++) {
        if (i % m == 0 || i % n == 0 || i % k == 0) count++;
    }
    cout << count << endl;
    return 0;
}