#include <bits/stdc++.h>
int main() {
  int i, c1, c2, c3, c4, n, m, a[1005], b[1005], a1[1005], b1[1005],
      sum1 = 0, sum2 = 0, total;
  scanf("%d%d%d%d%d%d", &c1, &c2, &c3, &c4, &n, &m);
  for (i = 0; i < n; i++) scanf("%d", &a[i]);
  for (i = 0; i < m; i++) scanf("%d", &b[i]);
  for (i = 0; i < n; i++) {
    if (a[i] * c1 < c2)
      a1[i] = a[i] * c1;
    else
      a1[i] = c2;
    sum1 += a1[i];
  }
  for (i = 0; i < m; i++) {
    if (b[i] * c1 < c2)
      b1[i] = b[i] * c1;
    else
      b1[i] = c2;
    sum2 += b1[i];
  }
  if (sum1 > c3) sum1 = c3;
  if (sum2 > c3) sum2 = c3;
  if (sum1 + sum2 > c4)
    total = c4;
  else
    total = sum1 + sum2;
  printf("%d\n", total);
  return 0;
}
