#include<bits/stdc++.h>
using namespace std;

#define int long long

signed main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int N,K;
	cin>>N>>K;
	vector<int>a(N+1),b(N+1);
	for(int i=1;i<=N;i++){
		cin>>a[i];
	}
	for(int i=1;i<=N;i++){
		cin>>b[i];
	}
	vector<vector<int>>dp0(K+1,vector<int>(N+1,0)),dp1(K+1,vector<int>(N+1,0));
	for(int i=1;i<=K;i++){
		for(int j=1;j<=N;j++){
			dp0[i][j]=max(dp0[i][j-1],dp0[i-1][j]);
			dp0[i][j]=max(dp0[i][j],dp0[i-1][j-1]+b[j]);
			dp1[i][j]=max(dp1[i][j],dp0[i-1][j-1]+b[j]);
			if(a[j-1]<a[j]){
				dp1[i][j]=max(dp1[i][j],dp1[i][j-1]+b[j]);
			}
			dp0[i][j]=max(dp0[i][j],dp1[i][j]);
		}
	}
	cout<<dp0[K][N]<<'\n';
	return 0;
}