#include<fstream>
using namespace std;
#include<cstring>
char c[1000001];
short m[1000001],dd[21];
long long mod(short a[],int n,long long d)
{
	int r=0;
	for(int i=1;i<=n;i++)
		r=(r*10+a[i])%d;
	return r;
}
void add(short a[],int n,short b[],int m)
{
	int t=0,i,j;
	a[0]=b[0]=0;
	for(i=n,j=m;i && j;i--,j--)
	{
		a[i]+=b[j]+t;
		if(a[i]>9)
		{
			a[i]-=10;
			t=1;
		}
		else
			t=0;
	}
	while(t)
	{
		a[i]++;
		if(a[i]>9)
		{
			a[i]-=10;
			t=1;
		}
		else
			t=0;
		i--;
	}
}	
int main()
{
	ifstream fcin("next.in");
	ofstream fcout("next.out");
	int n,i,nr=0;
	long long d;
	fcin.get(c,1000000);
	n=strlen(c);
	fcin>>d;
	for(i=0;i<n;i++)
		m[i+1]=c[i]-'0';
	if(mod(m,n,d)==0)
		for(i=1;i<=n;i++)
			fcout<<m[i];
	else
	{
		d-=mod(m,n,d);
		while(d)
		{
			dd[++nr]=d%10;
			d/=10;
		}
		add(m,n,dd,nr);
		if(m[0])
			fcout<<m[0];
		for(i=1;i<=n;i++)
			fcout<<m[i];
	}
	return 0;
}