def count_Hexadecimal(L,R) :  
    count = 0;  
    for i in range(L,R + 1) : 
        if (i >= 10 and i <= 15) : 
            count += 1;  
        elif (i > 15) : 
            k = i;  
            while (k != 0) :  
                if (k % 16 >= 10) : 
                    count += 1;  
                k = k // 16;  
    return count;  