No problem: U2, Bon Jovi(3 times), Muse, Joe Cocker, Guns n Roses, John Fogerty, Kid Rock, Ac/Dc, well ok 9 concerts!
How many did you guys saw?
http://www.u2interference.com/forums/f225/u2-360-boxscore-discussion-200001-65.html#post7051693 - You have written that you have attended 2 U2 concerts. I know that you saw both U2 shows in Zagreb. So where did you see U2 this year? Oh, wait
and you have problems with math - you can't even count to 10