{"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":"鉴于大家之后遇到的英文题面会越来越多,今天我们来熟悉几个常见单词:\n“positive——正的”“even number——偶数”,“prime——素数”“odd number——奇数”\n那么下面这道题,你能解决它吗?\nHow many ways are there to split an even number into the sum of two different primes?"}},{"title":"Input","value":{"format":"MD","content":"输入包含一些\"positive even numbers\",其值不会超过10000,个数不会超过500,若遇0,则结束。"}},{"title":"Output","value":{"format":"MD","content":"对应每个输入,输出其拆成不同\"prime\"的个数,每个结果占一行。"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e30\n26\n0\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003e3\n2\u003c/pre\u003e"}},{"title":"Hint","value":{"format":"MD","content":""}}]}