#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4;
  scanf("%d %d %d %d", &c1, &c2, &c3, &c4);
  int n, m;
  scanf("%d %d", &n, &m);
  int w;
  int sum1 = 0;
  int sum2 = 0;
  while (n--) {
    scanf("%d", &w);
    sum1 += min(w * c1, c2);
  }
  while (m--) {
    scanf("%d", &w);
    sum2 += min(w * c1, c2);
  }
  int ret = min(c4, c3 << 1);
  ret = min(c3 + min(sum1, sum2), ret);
  ret = min(sum1 + sum2, ret);
  printf("%d\n", ret);
  return 0;
}
