int main(int argc, char* argv[])
{
	int x,y,i,j,k=0,a[100],b[100];
	scanf("%d%d",&x,&y);
	a[1]=x;
	b[1]=y;
	for(i=1;a[i]>1;i++)
	{
		if(a[i]%2==0)
		{
			a[i+1]=a[i]/2;
		}
		else
		{
			a[i+1]=(a[i]-1)/2;
		}
	}
	for(j=1;b[j]>1;j++)
	{
		if(b[j]%2==0)
		{
			b[j+1]=b[j]/2;
		}
		else
		{
			b[j+1]=(b[j]-1)/2;
		}
	}
	for(i=1;a[i]>=1;i++)
	{
		for(j=1;b[j]>=1;j++)
		{
			if(b[j]==a[i])
			{
				printf("%d",b[j]);
				k=1;
				break;
			}
		}
		if(k==1)
		{
		break;
		}
	}
	return 0;
}