How to merge a specific commit in Git

I have forked a branch from a repository in GitHub and committed something specific to me. Now I found the original repository had a good feature which was at HEAD.

I want to merge it only without previous commits. What should I do? I know how to merge all commits:

git branch -b a-good-feature
git pull repository master
git checkout master
git merge a-good-feature
git commit -a
git push