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#include<fstream>
#include<string.h>
#include<algorithm>
using namespace std;
ifstream f("next.in");
ofstream g("next.out");
int a[1000005], b[1000005];
char s[1000005];
void add(int A[], int B[])
{
int i,t = 0;
for (i=1;i<=A[0]||i<=B[0]||t;i++)
{
t+=A[i]+B[i];//depasirea
A[i]=t%10;t/=10;
}
A[0]=i-1;//dimensiunea numarului suma o tin minte in A[0]
}
long long mod(int A[], long long B)
{
int i;
long long t = 0;
for (i = A[0]; i > 0; i--) t = (t * 10 + A[i]) % B;
return t;
}
int main()
{
long long d, r;
int i,aux;
f.getline(s,1000005);
for(i=0;i<strlen(s);i++)
a[++a[0]]=s[i]-'0';
reverse(a+1, a+a[0]+1);
f>>d;
r=mod(a, d);
if(r>0) r=d-r;
while(r)
{
b[++b[0]]=r%10;
r/=10;
}
add(a,b);
for(i=a[0];i>0;i--) g<<a[i];
f.close();g.close();return 0;
}