Problems Description
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">求一items自然数的所有约数之和</span>
Input格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">一行，一items整数</span>
Output格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">一行，这items整数的约数之和</span>
Sample
Sample Input 1
6
Sample Output 1
12
Submit Code
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