#include<stdio.h>

long long a,b,m,n;

int main(void)
{
    freopen("multiplu.in","r",stdin);
    freopen("multiplu.out","w",stdout);
    scanf("%lld",&a);
    scanf("%lld",&b);
    m=1;
    while(m%a!=0&&m%b!=0)
    {
        m++;
        n=m;
        m=0;
        while(n)
        {
            if(n%10==2)
            {m=m*10+1;
            m=m*10;}
            else
              if(n%10==1)
              m=m*10+1;
              else
               m=m*10;

           n=n/10; }
        }
    printf("%lld",m);
    return 0;
    }