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#include <iostream>
#include <fstream>
#include <string>
using namespace std;
ifstream fin ("next.in");
ofstream fout ("next.out");
long long impartire(const string& n, long long d) {
long long t=0;
for (char i : n) {
t=(t*10+(i-'0'))%d;
}
return t;
}
string adunare(string n, long long val) {
long long t=val;
for (int i=n.length()-1; i>=0; i--) {
if (t>0) {
long long curr=(n[i]-'0')+t;
n[i]=(curr%10)+'0';
t=curr/10;
}
}
if (t>0) {
n=to_string(t)+n;
}
return n;
}
int main() {
string n;
long long d,r,dif;
fin>>n>>d;
r=impartire(n, d);
if (r==0) {
fout<<n<<endl;
} else {
dif=d-r;
string sol=adunare(n, dif);
fout<<sol<<endl;
}
return 0;
}