#include <stdio.h>
#include <iostream>

using namespace std;

int A, B;
int cfg;
long long nrRez;

void trans( long long &nrRez ) {
	long long bz = 1;
	long long rez = 0;
	for ( int k = 0; k <= 24; k++ ) {
		if ( (nrRez%(bz*10))/bz == 2 ) {
			nrRez += bz*10;
			nrRez -= 2 * bz;
		}
		else break;
		bz *= 10;
	}
}

int main()
{
	freopen("multiplu.in","r",stdin);
	freopen("multiplu.out","w",stdout);

	scanf("%d %d\n", &A, &B );

	for ( nrRez = 1; nrRez <= 3000000000000000000LL; nrRez++ ) {
		trans( nrRez );
		if ( nrRez % A == 0 && nrRez % B == 0 )
			break;
	}
	printf("%lld\n", nrRez );

	fclose(stdin);
	fclose(stdout);

	return 0;
}