#include <fstream>
#include <cstring>
using namespace std;

short int N[1000001], R[16];
char X[1000001];
long long D;

int main()
{
    ifstream fin("next.in");
    ofstream fout("next.out");
    
    long long rest = 0; int i, t = 0;
    fin >> X >> D;
    N[0] = strlen(X);
    for (i = 0; i < N[0] && '0' <= X[i] && '9' >= X[i]; i++)
        N[N[0] - i] = X[i] - '0';

    for (i = N[0]; i > 0; i--)  
        rest = (rest * 10 + N[i]) % D;
    
    rest = (D - rest) % D;
    while (rest)
    {
          R[++R[0]] = rest % 10;
          rest /= 10;
    }
    if (!R[0]) R[0] = 1;
    
    for (i = 1; i <= N[0] || i <= R[0] || t; i++, t /= 10)  
          N[i] = (t += N[i] + R[i]) % 10;
    N[0] = i - 1;

    for (i = N[0]; i > 0; i--)
        fout << N[i];
    fout << "\n";
    
    fin.close();
    fout.close();
    return 0;
}