Can I wish my students all the best in the mid-term exam paper? I am setting up mid-term exam paper for engineering students.

As a new Assistant Professor, I will like to know is it okay
to put "All the Best with your exam" or "Happy Problem Solving" at the end of the question paper?

Will it be frowned upon by my colleagues or taken sarcastically by my students?
As a student, I'd appreciate my professor wishing me the best for the exam. 

If I were to make a suggestion though, it'd be better to write "All the best" at the start of the paper, right after the general instructions section. 

Even better if you could drop in before the start of the exam and wish the students in person.