#include <iostream>
#include<algorithm>
#include<stdio.h>
#include<vector>
#include<cmath>
#include<cstring>
using namespace std;
int main (){
    
       long int a;
    int x;
    long int b(1);
    
    cin>>a;
    cin>>x;
    for(int i=0;i<x;i++)
    {
              b=b*10;}
    //cout<<b;
    
    int lol;
    
    if(a==0){cout<<0;
    goto l1;}
    
    if (b>a || b==a)
    {cout<<b;}
    
    
    if(a>b)
    {
        lol=a%b;
                
        if(lol<5*b/10){
        a=a-lol;
        }
        else
        {
            a=a+b-lol;}
        cout<<a<<endl;}


l1:{//system("pause");
return 0;}
}