#include<iostream>
#include<cmath>
using namespace std;

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




return 0;}