What is the Gospel? (Just Jesus Evangelistic Campaign)

What is the Gospel? According to 1 Corinthians 15:1-4, the Gospel is embodied in these words: "Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures."
 
1 Corinthians 2:2 says, "For I determined not to know any thing among you, save Jesus Christ, and him crucified."