#include <fstream>
#include <string.h>
using namespace std;
ifstream f("next.in");
ofstream g("next.out");
int n,v[1000002],k2,k1,i;
long long d,r;
char s[1000002];
int main()
{
    f>>s;
    f>>d;
    n=strlen(s);
    for(i=0;i<n;i++){
        v[i]=s[i]-'0';
        r=(r*10+v[i])%d;
    }
if(r!=0){
    r=d-r;
    k1=r;
    for(i=n-1;i>=0;i--){
        k2=(v[i]+k1);
        v[i]=k2%10;
        k1=k2/10;
    }
    if(k1!=0)
        g<<k1;
}
    for(i=0;i<n;i++)
        g<<v[i];
    return 0;
}