#include <iostream>
#include <fstream>

using namespace std;

bool verificare (int n)
{
    while( n > 0)
    {
        if( n%10 != 0 && n%10 != 1 )
            return  false;
        n = n/10;
    }
    return true;
}

int main()
{
    int a,b,d;

    ifstream in("multiplu.in");
    in>>a>>b;
    in.close();

    ofstream out("multiplu.out");
    if(verificare(a*b) == false)
    {
        d = 2;
        while(!verificare(a*b*d))
            d++;
        out<<a*b*d;
    }
    else out<<a*b;
    out.close();

    return 0;
}