{"trustable":false,"sections":[{"title":"","value":{"format":"MD","content":"数论只会GCD,现在SonG给你一个n很大,他现在想知道1到n的所有数字与n的最大公约数之和。"}},{"title":"Input","value":{"format":"MD","content":"多组输入\n每一组一行一个n (1\u003cn\u003c2^31)\n"}},{"title":"Output","value":{"format":"MD","content":"输出一行一个数,表示你的答案"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre class\u003d\"sio\"\u003e2\n6\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre class\u003d\"sio\"\u003e3\n15\u003c/pre\u003e"}}]}