#include <cstdio>

using namespace std;

int main( void ) {
  int c, k;
  scanf( "%d %d", &c, &k );
  
  int a = 1;
  for( int i = 0; i < k; ++i )
    a *= 10;
  int y = ( c/a )*a;
  if( ( c%a ) >= a/2 ) y += a;
  printf( "%d\n", y );
  return 0;
}