#include <bits/stdc++.h>
using namespace std;
int main() {
  int c1, c2, c3, c4, n, m, i, x, y;
  scanf("%d", &c1);
  scanf("%d", &c2);
  scanf("%d", &c3);
  scanf("%d", &c4);
  scanf("%d", &n);
  scanf("%d", &m);
  int b1[n + 1];
  int s1[m + 1];
  for (i = 1; i <= n; i++) scanf("%d", &b1[i]);
  for (i = 1; i <= m; i++) scanf("%d", &s1[i]);
  int sum1 = 0, sum2 = 0, sum = 0;
  for (i = 1; i <= n; i++) {
    x = b1[i] * c1;
    y = c2;
    if (x >= y)
      sum1 += y;
    else
      sum1 += x;
  }
  if (sum1 >= c3) sum1 = c3;
  for (i = 1; i <= m; i++) {
    x = s1[i] * c1;
    y = c2;
    if (x >= y)
      sum2 += y;
    else
      sum2 += x;
  }
  if (sum2 >= c3) sum2 = c3;
  sum = sum1 + sum2;
  if (sum >= c4) sum = c4;
  printf("%d\n", sum);
  return 0;
}
