The coach of a Little League team made up a game called fielding practice. A player got 10 points for catching a pop fly and making a good throw, 8 points for catching a pop fly and making a bad throw, 7 points for fielding a grounder and making a good throw, 5 points for fielding a grounder and making a bad throw, and 1 point for a good throw after making a catching error ( on either a pop fly or grounder). He scored 20 points in this game. In how many ways could he have scored 20 points?