#include <stdio.h>
FILE *f=fopen("next.in", "r"), *g=fopen("next.out", "w");
long long n, d;
int main(void)
{
fscanf(f, "%lld%lld", &n, &d);
if (n%d)
	fprintf(g, "%lld", ((n/d)+1)*d);
else
	fprintf(g, "%lld", n);
fcloseall();
return 0;
}