{"trustable":false,"prependHtml":"\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 async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"MD","content":" 上一次是JK学长爬山,这一次轮到ly学姐爬山了,学姐也是爬到10000.0米的时候感觉非常累 。然后学姐开始想:假如从k\u003d1开始计数,每步升高的高度为10000/k²米,我一共走n步能到达多高的高度h?学姐只喜欢睡觉,所以想让你计算一下"}},{"title":"Input","value":{"format":"MD","content":"有多组测试用例,对于每组测试用例,只有一行输入,包含一个正整数n;1≤n≤10^200000."}},{"title":"Output","value":{"format":"MD","content":"输出一个保留5位小数的数字 ——————学姐能到达的高度h/10000的结果。"}},{"title":"Sample Input","value":{"format":"MD","content":"1\n2\n4\n8\n15"}},{"title":"Sample Output","value":{"format":"MD","content":"1.00000\n1.25000\n1.42361\n1.52742\n1.58044"}},{"title":"","value":{"format":"MD","content":" 当输入1时,输出10000/10000\u003d1.00000\n 当输入2时,输出(10000+10000/4)/10000 \u003d 1.00000+1/4\n 当输入3时,输出(10000+10000/4+10000/9)/10000\u003d1.00000+1/4+1/9\n ······以此类推;"}}]}