{"trustable":true,"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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eHi ICPCer, welcome to Xi\u0027an.\u003c/p\u003e\u003cp\u003eBeing a beautiful ancient city, Xi\u0027an is the capital city of Zhou, Qin, Han, and Tang Dynasties. With a long history, the streets in Xi\u0027an have a grid pattern. \u003c/p\u003e\u003cp\u003eAttracted by the streets\u0027 structure, Coach \u003cspan class\u003d\"tex-font-style-it\"\u003ePang\u003c/span\u003e would like to conduct his research on them. He draws an $$$n\\times m$$$ grid on the board. The grid consists $$$n+1$$$ vertical line segments and $$$m+1$$$ horizontal line segments. The vertical and horizontal line segments intersect at exactly $$$(n+1)\\times(m+1)$$$ points, forming $$$n\\times m$$$ unit squares. We call the $$$(n+1)\\times (m+1)$$$ intersections \u003cspan class\u003d\"tex-font-style-it\"\u003egrid point\u003c/span\u003es. Output the number of line segments(not only vertical or horizontal) $$$l$$$ satisfying the following three conditions: \u003c/p\u003e\u003col\u003e \u003cli\u003e The length is not zero. \u003c/li\u003e\u003cli\u003e Both endpoints of $$$l$$$ are grid points. \u003c/li\u003e\u003cli\u003e The midpoint of $$$l$$$ is a grid point. \u003c/li\u003e\u003c/ol\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe only line contains two integers $$$n, m$$$($$$1\\le n, m\\le 1000$$$).\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003ePrint the answer in a single line.\u003c/p\u003e"}},{"title":"Examples","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\u003e1 1\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e0\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","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 3\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e14\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}