{"trustable":false,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eThe hero of our story, Valera, and his best friend Arcady are still in school, and therefore they spend all the free time playing turn-based strategy \"GAGA: Go And Go Again\". The gameplay is as follows. \u003c/p\u003e\u003cp\u003eThere are two armies on the playing field each of which consists of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e men (\u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e is always even). The current player specifies for each of her soldiers an enemy\u0027s soldier he will shoot (a target) and then all the player\u0027s soldiers shot simultaneously. This is a game world, and so each soldier shoots perfectly, that is he absolutely always hits the specified target. If an enemy soldier is hit, he will surely die. It may happen that several soldiers had been indicated the same target. Killed soldiers do not participate in the game anymore. \u003c/p\u003e\u003cp\u003eThe game \"GAGA\" consists of three steps: first Valera makes a move, then Arcady, then Valera again and the game ends. \u003c/p\u003e\u003cp\u003eYou are asked to calculate the maximum total number of soldiers that may be killed during the game. \u003c/p\u003e故事的主人公瓦莱拉和他最好的朋友阿卡迪还在上学,因此他们把所有的空闲时间都花在了玩回合制策略游戏 \"GAGA: Go And Go Again \"上。游戏玩法如下。\u003c/p\u003e\n\n游戏场上有两支军队,每支军队由 n 人组成( n 总是偶数)。当前玩家为自己的每个士兵指定一个要射杀的敌方士兵(目标),然后所有玩家的士兵同时被射杀。这是一个游戏世界,因此每个士兵的射击都是完美的,即他绝对总是能击中指定的目标。如果一名敌方士兵被击中,他必死无疑。可能会出现多个士兵同时瞄准同一目标的情况。死亡的士兵将不再参与游戏。\n\u003c/p\u003e\n游戏 \"GAGA \"包括三个步骤:先是 Valera 走一步棋,然后是 Arcady 走一步棋,最后 Valera 再走一步棋,游戏结束。\u003c/p\u003e\n\n要求您计算游戏中可能被杀死的士兵总数上限。"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe input data consist of a single integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e2 ≤ \u003ci\u003en\u003c/i\u003e ≤ 10\u003csup class\u003d\"upper-index\"\u003e8\u003c/sup\u003e\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e is even). Please note that before the game starts there are \u003cspan class\u003d\"tex-span\"\u003e2\u003ci\u003en\u003c/i\u003e\u003c/span\u003e soldiers on the fields. \u003c/p\u003e输入数据由单个整数 n ( 2 ≤ n ≤ 108 、 n 为偶数)组成。请注意,游戏开始前,场地上有 2n 个士兵。"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003ePrint a single number — a maximum total number of soldiers that could be killed in the course of the game in three turns.\u003c/p\u003e"}},{"title":"Sample 1","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e2\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Sample 2","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e4\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eThe first sample test:\u003c/p\u003e\u003cp\u003e1) Valera\u0027s soldiers 1 and 2 shoot at Arcady\u0027s soldier 1.\u003c/p\u003e\u003cp\u003e2) Arcady\u0027s soldier 2 shoots at Valera\u0027s soldier 1.\u003c/p\u003e\u003cp\u003e3) Valera\u0027s soldier 1 shoots at Arcady\u0027s soldier 2.\u003c/p\u003e\u003cp\u003eThere are 3 soldiers killed in total: Valera\u0027s soldier 1 and Arcady\u0027s soldiers 1 and 2.\u003c/p\u003e1) 瓦勒拉的士兵 1 和 2 向阿卡迪的士兵 1 射击。\u003c/p\u003e\n\n2) 阿卡迪的士兵 2 向瓦勒拉的士兵 1 射击。\u003c/p\u003e\n\n3) Valera 的士兵 1 向 Arcady 的士兵 2 射击。\n\u003c/p\u003e\n共有 3 名士兵阵亡:Valera 的士兵 1、Arcady 的士兵 1 和 2。"}}]}