Recommendations
Description
VK news recommendation system daily selects interesting publications of one of $n$ disjoint categories for each user. Each publication belongs to exactly one category. For each category $i$ batch algorithm selects $a_i$ publications.
The latest A/B test suggests that users are reading recommended publications more actively if each category has a different number of publications within daily recommendations. The targeted algorithm can find a single interesting publication of $i$-th category within $t_i$ seconds.
What is the minimum total time necessary to add publications to the result of batch algorithm execution, so all categories have a different number of publications? You can't remove publications recommended by the batch algorithm.
The first line of input consists of single integer $n$ — the number of news categories ($1 \le n \le 200\,000$).
The second line of input consists of $n$ integers $a_i$ — the number of publications of $i$-th category selected by the batch algorithm ($1 \le a_i \le 10^9$).
The third line of input consists of $n$ integers $t_i$ — time it takes for targeted algorithm to find one new publication of category $i$ ($1 \le t_i \le 10^5)$.
Print one integer — the minimal required time for the targeted algorithm to get rid of categories with the same size.
Input
The first line of input consists of single integer $n$ — the number of news categories ($1 \le n \le 200\,000$).
The second line of input consists of $n$ integers $a_i$ — the number of publications of $i$-th category selected by the batch algorithm ($1 \le a_i \le 10^9$).
The third line of input consists of $n$ integers $t_i$ — time it takes for targeted algorithm to find one new publication of category $i$ ($1 \le t_i \le 10^5)$.
Output
Print one integer — the minimal required time for the targeted algorithm to get rid of categories with the same size.
Samples
5
3 7 9 7 8
5 2 5 7 5
6
5
1 2 3 4 5
1 1 1 1 1
0
Note
In the first example, it is possible to find three publications of the second type, which will take 6 seconds.
In the second example, all news categories contain a different number of publications.