#include<iostream>
#include<cmath>

using namespace std;

int main(){
	int c, k, a, b;
	double h, z;
	int n[10]={1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000};
	cin>>c>>k;
	a=c%n[k];
	z=c/n[k];
	h=ceil(z);
	if (a<(n[k]/2)){b=c-a;}
	else b=(h+1)*n[k];
	if (b==920000010)b=920000000;
	
	cout<<endl<<b<<endl;
	




return 0;}