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#include <bits/stdc++.h>
#define maxN 1000005
using namespace std;
int a[maxN], n, i;
long long d;
long long rez;
char s[maxN];
long long imp(long long x)
{
int i;
long long r = 0;
for(i = n; i >= 1; i--)
r = r*10LL+1LL*a[i], r %= x;
return r;
}
void add(long long x)
{
int i;
long long t;
for(i = 1; i <= n && x > 0; i++)
t=a[i]+x, a[i]=t%10, x=t/10;
while(x)
a[++n] = x%10, x /= 10;
}
int main()
{
ifstream f("next.in");
ofstream g("next.out");
f >> s;
f >> d;
n = strlen(s);
int poz = 0;
for(i = n-1; i >= 0; i--)
a[++poz] = s[i]-'0';
rez = imp(d);
if(rez > 0) add(d-rez);
for(i = n; i >= 1; i--)
g << a[i];
return 0;
}