#include <cstdio>
#include <algorithm>
#include <cstring>
using namespace std;
int a[1000005];
void printh(int x[])
{
    for(int i = x[0]; i >= 1; i--)
        printf("%d",x[i]);
    printf("\n");
}

long long resthugeint(long long k)
{
    long long r;
    int i;
    r = 0;
    for(i = a[0];i >= 1;i--)
    {
        r = 10 * r + a[i];
        r = r % k;
    }
    return r;
}

void adunh(int a[],int b[])
{
    int i,tr,aux,l;
    tr = 0;
    l = max(a[0],b[0]);
    for(i = 1;i <= l;i++)
    {
        aux = a[i] + b[i] + tr;
        a[i] = aux % 10;
        tr = aux / 10;
    }
    while(tr)
    {
        a[++a[0]] = tr % 10;
        tr /= 10;
    }
}

void ini(long long c)
{
    int b[20];
    memset(b,0,sizeof(b));
    do
    {
        b[++b[0]] = c % 10;
        c /= 10;
    }while(c);
    adunh(a,b);
}

int main()
{
    freopen("next.in", "r",stdin);
    freopen("next.out", "w",stdout);
    long long d,r,c;
    int i;
    char ch;
    a[0] = 0;
    scanf("%c", &ch);
    while(ch != '\n' && ch != ' ')
    {
        a[++a[0]] = ch - 48;
        scanf("%c", &ch);
    }
    for(i = 1;i <= a[0] / 2;i++)
        swap(a[i],a[a[0] - i + 1]);
    scanf("%I64d", &d);
    r = resthugeint(d);
    c = d - r;
    if(c != d)
        ini(c);
    printh(a);
    return 0;
}