{"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":"给定N和一个大小为M的集合,集合元素为非负整数。求1到N内是集合里任意一个数的倍数的数字个数。n\u003c\u003d2^31,m\u003c\u003d10\n\n样例中, N\u003d12, 集合M{2,3}, 倍数的集合就是 {2,3,4,6,8,9,10},\n\n"}},{"title":"Input","value":{"format":"MD","content":"有多组输入,每组第一行是N和M,第二行就是M个正整数,这M个正整数不超过20"}},{"title":"Output","value":{"format":"MD","content":"输出倍数集合的大小,每组一行"}},{"title":"Sample Input","value":{"format":"MD","content":"```\n12 2\n2 3\n```"}},{"title":"Sample Output","value":{"format":"MD","content":"```7```"}}]}