#include <fstream>
#include <cstring>
using namespace std;
ifstream f ("next.in");
ofstream g ("next.out");
char t[1000005],s[1000005];
long long d,r;
int n;
int main()
{
    f>>(t+1);
    f>>d;
    n=strlen(t+1);
    for(int i=n;i>=1;--i) //calculam restul nr impartit la d
    {
        s[i]=t[n-i+1]-'0';
        r=(r*10+s[i])%d;
    }
    r=(d-r)%d; //calculam ce trb adunat pana cand va fi multiplu de d
    for(int i=1;i<=n||r;++i,r/=10) s[i]=(r+=s[i])%10;
    while(s[n+1]) ++n;
    for(int i=n;i>=1;--i) g<<int(s[i]);
    return 0;
}