#include<stdio.h>
#include<string.h>
using namespace std;
int a[1000005],b[105];
long long d;
long long rest()
{
    int i;long long t=0;
    for(i=a[0];i;i--)
        t=(t*10+a[i])%d;
    return t;
}
void aduna()
{
    int i;long long t=0;
    for(i=1;i<=a[0] || i<=b[0] || t;++i,t/=10)
        a[i]=(t+=a[i]+b[i])%10;
    a[0]=i-1;
}
int main()
{
    int i;char s[1000005];
    long long r=0,lol;
    freopen("next.in","r",stdin);
    freopen("next.out","w",stdout);
    gets(s);scanf("%ld",&d);
    for(i=strlen(s)-1;i>=0;i--)
        a[++a[0]]=s[i]-'0';
    lol=rest();
    r=(d-lol)%d;
    while(r){
        b[++b[0]]=(int)r%10;
        r/=10;
    }
    aduna();
    for(i=a[0];i;i--)
        printf("%d",a[i]);
    fclose(stdin);fclose(stdout);
    return 0;
}