{"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":"素数被认为是独一无二的数, 但合数不是,因为合数可以由素数组成;\n比如 :\n 20 \u003d 13 +7\n 20 \u003d 17 + 3\n把一个偶数拆成两个不同素数的和,有几种拆法呢?"}},{"title":"Input","value":{"format":"MD","content":"输入包含一些正的偶数,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":"对应每个偶数,输出其拆成不同素数的个数,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"}}]}