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

#include <string.h>
#include <ctype.h>
long int potencija(int a)
{
    switch (a)
    {
        case 0: return 1; 
        case 1: return 10;
        case 2: return 100;
        case 3: return 1000;
        case 4: return 10000;
        case 5: return 100000;
        case 6: return 1000000;
        case 7: return 10000000;
        case 8: return 100000000;
        case 9: return 1000000000;
    }
}

int main()
{
    long int c,a=0,x[10];
    int k,i=0,j;
    scanf("%ld %d", &c, &k);
    while (a<c)
        a=a+potencija(k);       
    if( (c-(a-potencija(k))) < (potencija(k)/2) )  
        printf("%d", a-potencija(k));    
    else printf("%d", a);      
    
       
    return 0;
}