#include<stdio.h>
#include<string.h>
using namespace std;
int a[1000000],b[100];
int rest(int a[1000000],long int d)
{
    int i;long int t=0;
    for(i=a[0];i;i--)
        t=(t*10+a[i])%d;
    return t;
}
void aduna(int a[1000000],int b[100])
{
    int i,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[1000000];
    long int d,r;
    freopen("next.in","r",stdin);
    freopen("next.out","w",stdout);
    gets(s);scanf("%lld",&d);
    for(i=strlen(s)-1;i>=0;i--)
        a[++a[0]]=s[i]-'0';
    r=rest(a,d);
    r=d-r;
    while(r){
        b[++b[0]]=r%10;
        r/=10;
    }
    aduna(a,b);
    for(;a[0];a[0]--){
        printf("%d",a[a[0]]);
    }
    fclose(stdin);fclose(stdout);
    return 0;
}