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#include <cstdio>
#include <algorithm>
#include <cstring>
#include <cstdlib>
using namespace std;
const int NMAX=1000005;
inline void memset(int a[NMAX])
{
int i;
for(i=1;i<=NMAX;i++)
a[i]=0;
}
void print(int a[])
{
int i;
for(i=a[0];i>=1;i--)
printf("%d",a[i]);
printf("\n");
}
void h_adun(int a[],int b[],int c[NMAX])
{
int i,tr,aux;
memset(c);
c[0]=max(a[0],b[0]);
tr=0;
for(i=1;i<=c[0];i++)
{
aux=a[i]+b[i]+tr;
c[i]=aux%10;
tr=aux/10;
}
if(tr)
c[++c[0]]=tr;
}
int rest_h_int(int a[],int k)
{
int i,r;
r=0;
for(i=a[0];i>=1;i--)
{
r=r*10+a[i];
r=r%k;
}
return r;
}
int main()
{
freopen("next.in","r",stdin);
freopen("next.out","w",stdout);
char ch;
int a[NMAX],b[NMAX],c[NMAX],i,r,d,m,copie;
memset(a);
memset(b);
while(scanf("%c",&ch)==1 && ch!='\n')
if(ch>='0' && ch<='9')
a[++a[0]]=ch-'0';
reverse(a+1,a+a[0]+1);
scanf("%d",&d);
r=rest_h_int(a,d);
m=d-r;
copie=m;
for(i=1;i;i++)
{
b[i]=m%10;
m=m/10;
if(m==0)
{
b[0]=i;
break;
}
}
m=copie;
if(m!=d)
{
h_adun(a,b,c);
print(c);
}
else
print(a);
return 0;
}