{"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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cstyle type\u003d\u0027text/css\u0027\u003e .input, .output {border: 1px solid #888888;} .output {margin-bottom:1em;position:relative;top:-1px;} .output pre,.input pre {background-color:#EFEFEF;line-height:1.25em;margin:0;padding:0.25em;} .title {background-color:#FFFFFF;border-bottom: 1px solid #888888;font-family:arial;font-weight:bold;padding:0.25em;} \u003c/style\u003e \u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027]], displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027]]}\n });\n \u003c/script\u003e\n \u003cscript type\u003d\"text/javascript\" async\n src\u003d\"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\"\u003e\n \u003c/script\u003e\n\u003cp\u003eJie DL has a rectangular area of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eM\u003c/i\u003e × \u003ci\u003eN\u003c/i\u003e\u003c/span\u003e farm. And she has lots of SCSC chickens. The chicken\u0027s shape is \u003cspan class\u003d\"tex-span\"\u003e2 × 1\u003c/span\u003e. Jie DL love her chickens and she believe that the more chickens there are, the better. She would make the chickens lie in any way. But the chickens cannot overlap and the chickens must in her farm, otherwise Jie \n DL would very very very sad. (It is allowed to touch the edges of the farm.)\u003c/p\u003e\n\u003cp\u003eFind the maximum number of chicken, which can be held in Jie DL\u0027s farm under these restrictions.\u003c/p\u003e\n\u003cdiv align\u003d\"center\"\u003e\u003cimg src \u003d \"https://s2.ax1x.com/2019/10/09/u4zdfA.md.jpg\" width\u003d80% \u003e\u003c/div\u003e\n\u003cp text-algin\u003d\"center\"\u003e( 悄悄放上可爱揭师姐的照片\u003c/p\u003e\n\u003cp text-algin\u003d\"center\"\u003e( 再悄悄告诉你们揭大佬单身可撩\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eIn a single line you are given two integers \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eM\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eN\u003c/i\u003e\u003c/span\u003e — sizes of Jie DL\u0027s farm (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ \u003ci\u003eM\u003c/i\u003e ≤ \u003ci\u003eN\u003c/i\u003e ≤ 16\u003c/span\u003e).\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eOutput one number — the maximal number of Jie DL\u0027s chickens, which can be held in her farm.\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e2 4\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e4\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e3 3\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e4\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"Limit","value":{"format":"HTML","content":"Time limit: 2000 ms \u0026emsp; Memory limit: 262144 kB\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e"}}]}