Sentence:  For example , the marksman gets 5 shots , but we take his score to be the number of shots before his first bull's-eye , that is , 0 , 1 , 2 , 3 , 4 ( or 5 , if he gets no <WSD>bull's-eye</WSD> ) . 
Meaning of the word marked with <WSD> tags:  in target shooting: a score made by hitting the center of the target