#include <cstdio>
#include <algorithm>
#include <cstring>

const int MAX_DIGITS = 1<<10;

const int BASE = 10;

class HugeN
{
private:
	int x[MAX_DIGITS];
public:
	//constructori
	HugeN()
	{
		memset(x,0,sizeof(x));
		x[0]=1;
	}
	HugeN(int n)
	{
		memset(x,0,sizeof(x));
		x[0] = 0;
		do
		{
			x[++x[0]] = n%10;
			n = n/10;
		}while(n);
	}
	HugeN(char *s)
	{
		int n, i;
		n = strlen(s);
		x[0] = n;
		for(i=n-1; i>=0; i--)
			x[n-i] = s[i]-'0';
	}
	HugeN(const HugeN& other)
	{
		memcpy(x,other.x, sizeof(other.x));
	}
	void print()
	{
		for(int i =x[0]; i>=1; i--)
			printf("%d",x[i]);
		printf("\n");
	}
	//compararea a doua HugeN
	int cmp(const HugeN& other)
	{
		//x ? other
		if(x[0] < other.x[0]) return -1;
		else if(x[0]>other.x[0]) return 1;

		for(int i=x[0]; i>0; i--)
			if(x[i] < other.x[i]) return -1;
			else if(x[i] > other.x[i]) return 1;
		return 0;
	}


	HugeN operator +=(int k);
	long long operator %(long long k);
};
long long HugeN::operator % (long long k)
{
	int r=0, i;

	for(i=x[0]; i>0; i--)
	{
		r = r*10+x[i];
		r %= k;
	}
	return r;
}
HugeN HugeN::operator+=(int k)
{
	int t, i;
	for(t=0, i=1; i<=x[0]; i++)
	{
		t = x[i] + k%10 + t;
		x[i] = t%10;
		t/= 10;
		k /= 10;
	}
	if(t)
	{
		x[0]++;
		x[x[0]]=t;
		return *this;
	}
}
int main()
{
	freopen("next.in","r",stdin);
	freopen("next.out","w",stdout);
	char st[1000005];
	long long x, r;
	scanf("%s", st);
	scanf("%lld", &x);
	HugeN n(st);
	r = n%x;
	if(r)
	{
		r = x-r;
		n += r;
	}
	n.print();
}