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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("next.in");
ofstream g("next.out");
typedef int Huge[1000010];
Huge a;
long long d,r;
int i;
char c=0;
long long Mod(Huge A, long long X)
{ int i;
long long R=0;
for (i=A[0];i;i--)
R=(10*R+A[i])%X;
return R;
}
int main()
{ f.get(c);
while(c!='\n')
{ a[++a[0]]=c-'0';
f.get(c);
}
reverse(a+1,a+a[0]+1);
f>>d;
r=Mod(a,d);
if(r)
{ int i;
long long T=d-r;
for (i=1;i<=a[0];i++)
{ long long k=a[i]+T;
a[i]=k%10;
T=k/10;
}
while(T) {a[++a[0]]=T%10;T/=10;}
}
for(int i=a[0];i>=1;i--) g<<a[i];
return 0;
}