#include <stdio.h>
#include <stdlib.h>

int v[5000000];

int main() {
  FILE *fin = fopen( "deque.in", "r" ), *fout = fopen( "deque.out", "w" );
  int n, k, i, j0, j1, j2, a;
  long long s;
  fscanf( fin, "%d%d%d", &n, &k, &a );
  v[0] = a;
  j0 = 1;
  for ( i = 1; i < n; i ++ ) {
    fscanf( fin, "%d", &a );
    v[j0] = a;
    j0 ++;
    j1 = j0 - 2;
    j2 = 0;
    while ( j1 >= 0 && a < v[j1] && j2 < k - 1 ) {
      v[j1] = a;
      j2 ++;
      j1 --;
    }
  }
  s = 0;
  for ( i = 0; i < n - k + 1; i ++ ) {
    s += v[i];
  }
  fprintf( fout, "%lld", s );
  fclose( fin );
  fclose( fout );
  return 0;
}