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## Problem Description

Peanut is trying out a new, and very simple game. He starts off with 0 skill points in this game. There are a total of *N* skill moves he can choose to perform, with the *i*th skill move requiring a minimum of *M _{i}* skill points to perform, and earns him

*E*skill points if he performs it. Each skill move can only be performed once.

_{i}
Peanut does not have all the time in the world, and so can only perform up to *K* skill moves before he gets tired. Help him figure out what is the maximum number of skill points he can get by the end of the game.

## Input

The first line of input will contain two integers, *N* and *K*.

The second line of input will contain *N* integers, representing the array *M*.

The third line of input will contain *N* integers, representing the array *E*.

## Output

The output should contain exactly one integer, the maximum number of skill points Peanut can have at the end of the game.

## Limits

For all subtasks: 1 ≤ K ≤ N ≤ 300 000, 0 ≤ M_{i}, E_{i} ≤ 10^{9}.

Subtask 1 (37%): 1 ≤ K ≤ N ≤ 1000.

Subtask 2 (19%): M_{i} = 0.

Subtask 3 (44%): No additional constraints.

## Sample Input

4 3 0 3 4 5 4 1 2 7

## Sample Output

13

## Explanation

Peanut can first start by performing move 1 (requiring 0 points), giving him 4 points.

He then chooses to perform move 3 (requiring 4 points), giving him 2 points.

Lastly, he performs move 4 (requiring 5 points), giving him 7 points.

Therefore, in total he would have gained 4+2+7=13 points.

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 37 | 21 | 1s | 256MB | Minimum |

2 | 19 | 20 | 1s | 256MB | Minimum |

3 | 44 | 61 | 1s | 256MB | Minimum |

4 | 0 | 1 | 1s | 256MB | Minimum |

### Judge Compile Command

g++-7 ans.cpp -o skillmoves -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512