#include <cstdio>
#include <cstring>
#include <algorithm>

using namespace std;


int n, k; 
char g; 


int main ( void ) {
    scanf ( "%d", &n ) ;
    scanf ( "%d", &k ) ; 
    
    int b = 0; 
	int x = n ; 
	while ( b < k )  {
		g = ( x % 10 )  +  48 ;  	
		x = x / 10;

			
	}

    int c = 1;
    for ( int i = 0; i < k; ++i ) {
        c = c * 10 ; 
    }
    
	b = 0 ;     
    while (b < n ) { b = b + c  ; } ;   
  
    if ( g < 53 ) printf ( "%d", b-c ); else printf ( "%d", b ) ; 
    
    return 0;    
}