#include <cstdio>

int main(void) {
  int c, k, p = 1;
  scanf("%d%d", &c, &k);
  while (k--) p = p*10;
  int a = c-c%p;
  int b = a+p;
  if (b-c <= c-a) printf("%d\n", b);
  else printf("%d\n", a);
  return 0;
}