#include <bits/stdc++.h>
using namespace std;

int a, b, c, d, e;

int solve();

int main() {
  cin >> a >> b >> c >> d >> e;
  cout << solve() << endl;
  return 0;
}

int solve() {
  int res = 0, len = lcm(a + b, c + d);
  vector<int> memo(len + 1, 0);
  for (int i = 0; i < len; ++i) {
    bool x = i % (a + b) < a, y = i % (c + d) < c;
    memo[i + 1] = memo[i] + (x & y);
  }
  res += e / len * memo[len];
  e %= len;
  return res + memo[e];
}