int work( int m,int n )
{    while ( m != n )   
       { if( m > n ) m /= 2;
        if( m < n  ) n /= 2;
        }
        printf("%d",m);
     
} 
int main()
{   int a , b,m;
    scanf("%d %d",&a,&b);
    work(a,b);

}
