# include<algorithm>
# include<cstdio>
# include<cstring>
using namespace std;
const int NMAX=1000100;
 int a[NMAX], b[NMAX];
void printh(int x[])
{
    for(int i=x[0];i>=1;--i)
        printf("%d", x[i]);
printf("\n");
}
void adunh()
{
    int tr,i,aux,l;
    l=max(a[0],b[0]);
    tr=0;
    a[0]=l;
    for(i=1;i<=l;i++)
    {
        aux=a[i]+b[i]+tr;
        a[i]=aux%10;
        tr=aux/10;
    }
    while(tr)
    {
    	a[++a[0]]=tr%10;
    	tr=tr/10;
    }
}
long long  rest(long long k)
{
    long long  r=0;
    for(int i=a[0];i>=1;i--)
    {
        r=(10*r+a[i])%k;
    }
    return r;
}
int main()
{
    freopen("next.in","r",stdin);
freopen("next.out","w",stdout);
    
    long long d;
    char sir[NMAX];
    gets(sir);
    int n,i;
    n=strlen(sir);
    for(i=n-1;i>=0;i--)
        a[n-i]=sir[i]-'0';
    a[0]=n;
    scanf("%lld", &d);
long long  x,k;
if(rest(d)==0) printh(a);
else
{
x=d-rest(d);
k=0;
while(x!=0)
{
    k++;
    b[k]=x%10;
    x/=10;
}
b[0]=k;
adunh();
printh(a);
}
      return 0;
}