#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("next.in");
ofstream g("next.out");
long long d,rez,n;
short v[1000005];
string s;

int main()
{
    getline(f,s); n=s.size();
    f>>d;
    for(int i=n;i>=1;--i)
    {
        v[i]=s[n-i]-'0';
        rez=(rez*10+v[i])%d;
    }
    rez=(d-rez)%d;
    for(int i=1;i<=n||rez;++i,rez/=10)
    {
        v[i]=(rez+=v[i])%10;
    }
    n=1000001;
    while(!v[n]) --n;
    for(int i=n;i>=1;--i) g<<v[i];
    return 0;
}