#include <fstream>

using namespace std;
ifstream f("next.in");
ofstream g("next.out");
int v[1000009],i,rez[1000005],j;
long long x,nr,t;
int main()
{
    char c;
    f.get(c);
    while (c!='\n')
    {
        v[++v[0]]=c-'0';
        f.get(c);
    }
    f>>x;
    for (i=1;i<=v[0]/2;i++)
    {
        swap(v[i],v[v[0]-i+1]);
    }
    for (i=v[0];i>=1;i--)
    {
        nr=nr*10+v[i];
        nr=nr%x;
    }
    if (nr==0)
    {
        for (j=v[0];j>=1;j--)
        {
            g<<v[j];
        }
    }
    else
    {
        x=x-nr;
        while (x)
        {
            rez[++rez[0]]=x%10;
            x=x/10;
        }
        t=0;
        for (j=1;j<=max(v[0],rez[0]);j++)
        {
            int kk=v[j];
            v[j]=(v[j]+rez[j]+t)%10;
            t=(kk+rez[j]+t)/10;
        }
        v[0]=max(v[0],rez[0]);
        v[0]+=t;
        v[v[0]]+=t;
        for (j=v[0];j>=1;j--)
        {
            g<<v[j];
        }
    }
    return 0;
}