#include <cstdio>

long long n,d;
void citire()
{
	freopen("next.in","r",stdin);
	freopen("next.out","w",stdout);
	scanf("%lld%lld",&n,&d);
}
int mod(int A[],int B)
{
      int i,t=0;
      for (i=A[0];i>0;i--)
			t=(t*10+A[i])%B;
      return t;
}
/*void solve()
{
	int r=mod(n,d);
	n+=mod(d-r,d);
	printf("%d",n);
}*/
int main()
{
	citire();
	long long r=n%d;
	n=n+(d-r)%d;
	printf("%lld",n);
	//solve()
	return 0;
}