'summarize number of appearances of different values in different columns in Data Frame

For Example I have this data :

star1                  star2                star3            star4

Francis                Ron              Robert               Hen   
Francis                Ron              Shir                 Coppola              
Shir                   Ron              Francis              Coppola

I want to have :

Francis,3             
Coppola,2 
Ron,3
Shir,2
Robert,1
Hen,1

How can I do this?

python dataframe

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'summarize number of appearances of different values in different columns in Data Frame

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