#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("next.in");
ofstream out("next.out");
int v[1000005],a[1000005];
int main()
{
    int i,aux,tr;
    char ch;
    long long d,r=0,s;
    ch=in.get();
    while(ch!='\n')
    {
        v[++v[0]]=ch-'0';
        ch=in.get();
    }
    in>>d;
    for(i=1;i<=v[0];i++)
    {
        r=r*10+v[i];
        r=r%d;
    }
    s=d-r;
    do
    {
        a[++a[0]]=s%10;
        s=s/10;
    }
    while(s);
    reverse(v+1,v+v[0]+1);
    tr=0;
    for(i=1;i<=max(v[0],a[0]);i++)
    {
        aux=v[i]+a[i]+tr;
        v[i]=aux%10;
        tr=aux/10;
    }
    if(tr)
        v[++v[0]]=tr;
    reverse(v+1,v+v[0]+1);
    for(i=1;i<=v[0];i++)
        out<<v[i];
    return 0;
}