#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream in ("next.in");
ofstream out ("next.out");

const int MAXN = 1000010;

char S[MAXN];
int A[MAXN];

int main ()
{
	long long D, R = 0, now;
	int len, i, t = 0;
	
	in >> S;
	len = strlen (S);
	
	for (i = len - 1; i >= 0; i --)
		A[ ++ A[0] ] = (S[i] - '0');
	
	in >> D;
	
	for (i = A[0]; i; i --)
		R = ((long long) ((R * 10) + A[i]) % D);
	
	now = (D - R) % D;
	
	for (i = 1; i <= A[0]; i ++){
		A[i] += (now % 10) + t;
		t = A[i] / 10;
		A[i] %= 10;
		now /= 10;
	}

	if (t)
		A[ ++ A[0] ] = t;
	
	while (A[0])
		out << A[ A[0] --];
	
	return 0;
}