#include <bits/stdc++.h>
using namespace std;
const int INF = 9999999;
const int MOD = 1e9 + 7;
int main() {
  int a, b, c, d, e, ans = INF;
  cin >> a >> b >> c >> d >> e;
  for (int i = 0; i < 100001; ++i) {
    ans = min(ans, c * 2 * i + max(d - i, 0) * a + max(e - i, 0) * b);
  }
  cout << ans << endl;
}
