#include <iostream>

using namespace std;

void solve() {
    int a, b, c, d, e;
    cin >> a >> b >> c >> d >> e;

    auto count = [&](int t) {
        int ret = 0;
        for (int i = 0; i < t; ++i) {
            if (i % (a + b) < a &&
                i % (c + d) < c) ++ret;
        }
        return ret;
    };

    auto t = (a + b) * (c + d);
    cout << e / t * count(t) + count(e % t) << "\n";
}

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

    solve();

    return 0;
}