import std.conv, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.container, std.math, std.range, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken().to!int; }
long readLong() { return readToken().to!long; }
real readReal() { return readToken().to!real; }

void chmin(T)(ref T t, in T f) { if (t > f) t = f; }
void chmax(T)(ref T t, in T f) { if (t < f) t = f; }

int binarySearch(T)(in T[] as, in bool delegate(T) test) { int low = -1, upp = cast(int)(as.length); for (; low + 1 < upp; ) { int mid = (low + upp) >> 1; (test(as[mid]) ? low : upp) = mid; } return upp; }
int lowerBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a < val)); }
int upperBound(T)(in T[] as, in T val) { return as.binarySearch((T a) => (a <= val)); }


int N, K;
long[] P, B;

void main() {
  try {
    for (; ; ) {
      N = readInt();
      K = readInt();
      P = new long[N];
      foreach (i; 0 .. N) {
        P[i] = readLong();
      }
      B = new long[N];
      foreach (i; 0 .. N) {
        B[i] = readLong();
      }
      
      auto sum = new long[N + 1];
      foreach (i; 0 .. N) {
        sum[i + 1] = sum[i] + abs(P[i] - B[i]);
      }
      long ans = 0;
      foreach (k; 0 .. K) {
        ans += sum[N];
        int head = 0;
        foreach_reverse (i; 0 .. N - 1) {
          if (P[i] < P[i + 1]) {
            foreach_reverse (j; i + 1 .. N) {
              if (P[i] < P[j]) {
                head = i;
                P[i .. $] = P[j] ~ P[j + 1 .. N].reverse ~ P[i] ~ P[i + 1 .. j].reverse;
                goto found;
              }
            }
          }
        }
        P.reverse;
       found:
        foreach (i; head .. N) {
          sum[i + 1] = sum[i] + abs(P[i] - B[i]);
        }
      }
      writeln(ans);
    }
  } catch (EOFException e) {
  }
}