#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
const int MAX_DIGITS=1000001;
const int BASE=10;
//const int MAX_INT=(1LL << 31)-1;
char s[MAX_DIGITS+5];
using namespace std;
 
class HugeN
{
private:
    int x[MAX_DIGITS+5];
 
public:
    HugeN()
    {
        x[0]=1;
        for(int i=1; i <= MAX_DIGITS; i++)
            x[i]=0;
    }
 
    HugeN(int nr)
    {
        for(int i=0; i <= MAX_DIGITS; i++)
            x[i]=0;
        do
        {
            x[++x[0]] = nr%10;
        }
        while(nr);
    }
 
    HugeN(HugeN &other)
    {
        for(int i=0; i <= MAX_DIGITS; i++)
            x[i]=0;
        memcpy(x,other.x,sizeof(other.x));
    }
 
    HugeN (char *s)
    {
        x[0]=strlen(s);
        for(int i=1; i <= x[0]; i++)
            x[i] = s[x[0]-i]-'0';
 
    }
 
    void print()
    {
        int i;
        for(i=x[0]; i >= 1; i--)
            printf("%d", x[i]);
        printf("\n");
    }
 
    bool null();
    int nr_digits();
    void atr_int(int nr);
    void rev ();
    void reset ();
    void cpy_char(char *s);
    int cmp(const HugeN &other);
 
    //Operatori logici
    bool operator < (const HugeN &other);
    bool operator <=(const HugeN &other);
    bool operator > (const HugeN &other);
    bool operator >=(const HugeN &other);
    bool operator ==(const HugeN &other);
    bool operator !=(const HugeN &other);
 
    //Operatori aritmetici
    HugeN operator +(const HugeN &other);
    HugeN operator -(const HugeN &other);
    HugeN operator -(int k);
    HugeN operator *(int k);
    HugeN operator *(const HugeN &other);
    HugeN operator /(int k);
    HugeN operator /(const HugeN &other);
    long long operator % (long long k);
    HugeN operator % (const HugeN &other);
    HugeN operator ^ (int k);
    HugeN operator +=(const HugeN &other);
    HugeN operator -=(const HugeN &other);
    HugeN operator *=(int k);
    HugeN operator *=(const HugeN &other);
    HugeN operator /=(int k);
    HugeN operator +=(long long k);
};
 
int HugeN :: cmp (const HugeN &other)
{
    int i;
    if(x[0] > other.x[0])
        return 1;
    if(x[0]< other.x[0])
        return -1;
    for(i=x[0]; i >=1; i--)
        if(x[i] > other.x[i])
            return 1;
        else if(x[i] < other.x[i])
            return -1;
 
    return 0;
}
 
 
HugeN HugeN :: operator+(const HugeN &other)
{
    int i,tr=0,aux;
    HugeN temp;
    temp.x[0]=x[0] > other.x[0] ? x[0] : other.x[0];
    for(i=1; i<=temp.x[0]; i++)
    {
        aux=x[i]+other.x[i]+tr;
        temp.x[i]=aux%BASE;
        tr=aux/BASE;
    }
    if(tr)
    temp.x[++temp.x[0]]=tr;
    return temp;
}
 
 
HugeN HugeN :: operator+=(const HugeN &other)
{
    x[0]=x[0] > other.x[0] ? x[0] : other.x[0];
    int tr=0, aux, i;
    for(i=1; i<=x[0]; i++)
    {
        aux=x[i]+other.x[i]+tr;
        x[i]=aux%BASE;
        tr=aux/BASE;
    }
    if(tr)
        x[++x[0]]=tr;
    return (*this);
}
 
HugeN HugeN :: operator+=(long long k)
{
 
    long long aux,i;
    for(i=1; i<=x[0]; i++)
    {
        aux=x[i]+k;
        x[i]=aux%BASE;
        k=aux/BASE;
    }
    if(k)
        x[++x[0]]=k;
    return *this;
}
 
long long HugeN :: operator % (long long k)
{
    long long i,r=0;
    for(i=x[0]; i>=1; i--)
        r=(r*10+x[i])%k;
    return r;
 
}
 
int main()
{
    freopen("next.in", "r", stdin);
    freopen("next.out", "w", stdout);
    long long d,rest;
    gets(s);
    HugeN n(s);
    scanf("%lld", &d);
    rest=(d-n%d)%d;
    n+=rest;
        n.print();
 
    return 0;
}