public void solve(int testNumber, MyInputReader in, MyOutputWriter out) {
int n = in.nextInt();
for (int i = 0; i < n; i++) {
long v = in.nextLong();
out.printLine(primeSet.contains(v) ? "YES" : "NO");
}
}
public void solve(int testNumber, MyInputReader in, MyOutputWriter out) {
int n = in.nextInt();
final int[] A = new int[n], C = new int[n];
for (int i = 0; i < n; i++) {
A[i] = in.nextInt();
}
long sum = 0;
for (int i = 0; i < n; i++) {
C[i] = in.nextInt();
sum += C[i];
}
Integer[] order =
ArrayUtils.order(
n,
new Comparator<Integer>() {
@Override
public int compare(Integer o1, Integer o2) {
return A[o1] - A[o2];
}
});
long ret = 0;
for (int i = 1; i < n; i++) ret += (A[order[i]] - A[order[0]]) * C[order[i]];
long presum = C[order[0]];
long tmp = ret;
for (int i = 1; i < n; i++) {
int len = A[order[i]] - A[order[i - 1]];
tmp = tmp + presum * len - (sum - presum) * len;
ret = Math.min(ret, tmp);
presum += C[order[i]];
}
out.printLine(ret);
}