#include <iostream>
#include <fstream>
#include <cstring>
#define ll long long
using namespace std;
ifstream f ("next.in");
ofstream g ("next.out");

char v[1000010],s[1000010];
ll d;

ll Mod(char v[], ll d)
{
    ll r=0;
    for (unsigned i=0;i<strlen(v);i++)
    {
        r=r*10+v[i]-'0';
        r%=d;
    }
    return r;
}
int main()
{
    f.getline(v,1000005);
    f>>d;
    ll r=Mod(v,d);
    d-=r;
    if (r==0)
    {
        g<<v;
        return 0;
    }

    s[0]='0';
    s[1]=0;
    strcat(s,v);
    bool sw=true;
    for (int i=strlen(s)-1;i>=0&&(d||sw==true);i--)
    {
        s[i]+=d%10;
        if (s[i]>'9'&&i>0) s[i-1]++,s[i]-=10,sw=true;
        else sw=false;
        d/=10;
    }
    if (s[0]=='0') g<<s+1;
    else g<<s;
    return 0;
}