#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <cmath>
#include <vector>
#include <ctime>

using namespace std;

int main()
{
    int x,n;
    cin >> x >> n;
    vector<int> baba;
    while(x){baba.push_back(x%10);
             x/=10;
             }
    int najveci=baba.size();
    if(n<najveci){
    for(int i=0;i<n-1;i++){baba[i]=0;}
    if(baba[n-1]>4)baba[n]++;
    baba[n-1]=0;
    int prijelaz=0;
    for(int i=n;i<najveci;i++){if(prijelaz==1)baba[i]++;
                                    prijelaz=0;
                                    if(baba[i]>9){baba[i]=0;prijelaz=1;}
                                     }
    for(int i=najveci-1;i>=0;i--)cout << baba[i];
    cout << endl;
}
else { int potenc=1;
     for(int i=0;i<n;i++)potenc*=10; 
     if((najveci-n)>=0){
     if(baba[najveci-n]>4)cout << potenc << endl;
     }
     else cout << "0" << endl;
     }                                                
   // system("pause");
    return 0;
}