#include <bits/stdc++.h>
using namespace std;
ifstream fin("next.in");
ofstream fout("next.out");
string str;
int n;
long long d,add;
short int a[1000005];
long long mod(short int A[],long long d)
{
    long long x=0;
    for (int i=A[0];i>=1;i--)
        x=(x*10+A[i])%d;
    return x;
}
void adunare(short int A[])
{
    int t=add;
    for (int i=1;i<=A[0];i++)
    {
        t+=A[i];
        A[i]=t%10;
        t/=10;
    }
    while(t)
    {
        a[++a[0]]=t%10;
        t/=10;
    }
}
int main()
{
    getline(fin,str);
    n = str.size();
    fin>>d;
    for (int i=n;i>=1;i--)
    {
        a[i] = str[n-i] - '0';
    }
    a[0] = n;
    add = d - mod(a,d);
    adunare(a);
    for (int i=a[0];i>=1;i--)
        fout<<a[i];
    fout<<'\n';
    return 0;
}