#include <bits/stdc++.h>

using namespace std;
ifstream f("next.in");
ofstream g("next.out");
int n,d,r;

int main()
{
    f>>n>>d;
    if(n%d==0)
    {
        g<<n;
        return 0;
    }
    r=n%d;
    g<<n+d-r;
    return 0;
}