#include <cstdio>
#include <algorithm>
#include <cstring>
using namespace std;

const int MAX_DIGITS=1000001;
char s[MAX_DIGITS];
class hugen
{
private:
    int x[MAX_DIGITS];
public:
    hugen()
    {
        memset(x,0,sizeof(x));
        x[0]=1;
    }

    hugen(char *s)
    {
        int i;
        x[0]=strlen(s);
        for (i=1; i<=x[0]; i++)
            x[i]=s[x[0]-i]-48;
    }

    long long operator % (long long k)
    {
        int i;
        long long r=0;
        for (i=x[0]; i>=1; i--)
        {
            r=r*10+x[i];
            r=r%k;
        }
        return r;
    }
    hugen operator += (long long k)
    {

        long long tr=k,aux;

        for( int i=1; i<=x[0]; ++i)
        {
            aux=x[i]+tr;
            x[i]=aux%10;
            tr=aux/10;
        }
        while(tr)
        {
            x[++x[0]]=tr%10;
            tr/=10;
        }
        return*this;
    }

    void print()
    {
        for(int i=x[0]; i>=1; --i)
            printf("%d",x[i]);
        printf("\n");
    }
};
int main()
{
    freopen("next.in","r",stdin);
    freopen("next.out","w",stdout);
    long long d,r;

    gets(s);
    hugen n(s);
    scanf("%lld",&d);

    r=n%d;

    if(r==0)
    {
      n.print();
    }
    else {
      n+=(d-r);
      n.print();

    }

    return 0;
}