my reaction when i saw this was like [realyyyy](http://i.giphy.com/42k1WHX6mNpSM.gif)↵
↵
http://mirror.codeforces.com/contests/with/xuanhien070594↵
![ ](http://mirror.codeforces.com/predownloaded/ad/b7/adb7127cb909c829e82da886cbae538e78da753a.png)
↵
http://mirror.codeforces.com/contests/with/xuanhien070594↵
![ ](http://mirror.codeforces.com/predownloaded/ad/b7/adb7127cb909c829e82da886cbae538e78da753a.png)