the great hero guard country Homer live the hero attack power a initial health value B there n monster hero the ith monster attack power a_i initial health value b_i the hero monster say live health value positive greater equal 1 say dead health value nonpositive equal 0in order protect people country hero fight monster hero dead monster dead in fight hero select arbitrary living monster fight suppose ith monster select health value hero ith monster x y fight respectively after fight health value hero ith monster xa_i yA respectively note hero fight monster oncefor safety people country tell great hero kill monster great hero dead killing monster