#include <cstdio>
#include <algorithm>

using namespace std;

int main(){
  int C, K, iznos = 1;
  scanf( "%d %d", &C, &K );
  
  for( ; K > 0; K-- ) iznos *= 10;

  int manji = (C / iznos) * iznos, veci = (C/iznos+1)*iznos;
  
  if( C-manji < veci-C ) printf( "%d\n", manji );
  else printf( "%d\n", veci );

  return 0;
}