#include<fstream.h>
int main(){
ifstream f("multiplu.in");
ofstream g("multiplu.out");
long a,b,c,ok,i,d;
f>>a>>b;
d=a*b;
ok=0;
i=2;
while(ok==0){  c=d;
ok=1;
while(c!=0){if(c%10!=0&&c%10!=1){ok=0;c=0;}

c=c/10;}
d=(a*b)*i;
i++;}
d=d-(a*b);
g<<d;}