#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <algorithm>
#define Max 100

using namespace std;

long long int broj;
long long int broj2;
int nule,nule2;
long int modulo[Max];
int modan_broj=0;
int x(1);
int y(0);
int main(void)
{
    cin>>broj;
    cin>>nule;
    nule2=nule;
    broj2=broj;
    if (nule==0)cout<<broj;
    else{
         while(nule2!=0)
         {
             modan_broj+=(broj2%10)*x;
             broj2/=10;
             nule2--;
             x*=10;
         }
         if (modan_broj>=5*x/10){
             broj2++;
         }
         cout<<broj2;
         while (nule!=0){printf("%d", y); nule--;}
    }
    scanf("\n");
    return 0;
}