#include <stdio.h>

#define in "next.in"
#define out "next.out"

long long D, R, rest, N;

void Read();


FILE *fout = fopen( out, "w" );

int main()
{
    Read();
    
    fclose( fout );
    return 0;
}

void Read()
{
     FILE *fin = fopen( in, "r" );
     fscanf( fin, "%lld%lld", &N, &D );
     fclose( fin );
     R = N % D;
     rest = ( D - R ) % D;
     N += rest;
     fprintf( fout, "%lld\n", N );
}