1init 2set check 1 3set checkfrozen 1 4add 1 5add 2 6add 3 7add 0 8add -1 9add -2 10add -3 11add 0 12freeze 1 13freeze 2 14solve 15add -1 16add 2 17add 0 18add -1 19add 2 20add 0 21melt 2 22solve 23melt 1 24add 1 25add 0 26solve 27reset 28