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#include<fstream>
#include<iostream>
#include<cstring>
#define DN 2000005
using namespace std;
ifstream fin("next.in");
ofstream fout("next.out");
int n,a[DN];
long long d,s;
char b[DN];
void aduna()
{
long long t=s;
for(int i=1;i<=a[0];i++)
{
t=t+a[i];
a[i]=t%10;
t=t/10;
}
while(t)
{
a[0]++;
a[a[0]]=t%10;
t=t/10;
}
}
int main()
{
fin.getline(b+1,DN);
a[0]=strlen(b+1);
for(int i=1;i<=a[0];i++)
a[a[0]-i+1]=b[i]-'0';
fin>>d;
s=0;
for(int i=1;i<=a[0];i++)
s=(s*10+b[i]-'0')%d;
s=(d-s)%d;
aduna();
for(int i=a[0];i>0;i--)
fout<<a[i];
}