a girl name Xenia cupboard look like arc ahead the arc semicircle radius r cupboard wall height h cupboard side the cupboard depth r look like rectangle base r height hr side the figure show cupboard look like view leave view right Xenia get lot balloon birthday the girl hate mess want store balloon cupboard Luckily balloon sphere radius help Xenia calculate maximum number balloon cupboard you balloon cupboard can not balloon leave right view the balloon cupboard touch it allow squeeze balloon deform way you assume cupboard wall negligibly thin