#include <iostream>
#include <string>
#include <algorithm>
#include <utility>
#include <cmath>
#include <cstdlib>
#include <map>
#include <set>
#include <queue>
#include <vector>
using namespace std;

int main() {
	long long A, B, C, D, E; cin >> A >> B >> C >> D >> E;
	vector<bool> flag((A + B) * (C + D), false);

	for (int i = 0; i < (A + B) * (C + D); i++) {
		if (i % (A + B) < A && i % (C + D) < C) flag[i] = true;
	}

	int sum = 0;
	for (int i = 0; i < (A + B) * (C + D); i++) if (flag[i] == true) sum++;
	sum = sum * (E / ((A + B) * (C + D)));
	for (int i = 0; i < E % ((A + B) * (C + D)); i++) if (flag[i] == true) sum++;
	
	cout << sum << endl;
}