#include <bits/stdc++.h>
#define ll long long
#define MOD 1e9+7
#define FAST ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define LONG_MAX 1LL << 63
#define LONG_MIN -1LL << 63
#define INT_MAX 1<<31 -1
#define INT_MIN -1<<31 +1

using namespace std;
string fis="multiplu";
ifstream fin(fis+".in");
ofstream fout(fis+".out");

int a , b;
inline bool fa(ll x)
{
    while(x)
    {
        if(x % 10 >= 2)return false;
        x /= 10;
    }
    return true;
}
int main()
{
    fin >> a >> b;
    ll r = a * b;
    int cnt = 1;
    while(!fa(cnt * r))++cnt;
    fout << cnt * r;
}