#include<cstdio>

#include<cstring>

#include<cmath>

#include<algorithm>

#include<vector>

#include<queue>

#include<map>

#include<stack>

using namespace std;

int main()

{

    long long k,n;

    scanf("%lld%lld",&n,&k);

    printf("%lld\n",(n/k+)*k);

    return ;

}