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No.278 Sum of Consecutive Integers (2)

レベル : / AI推定難易度 : 1000 / 実行時間制限 : 1ケース 2.000秒 / メモリ制限 : 256 MB / 標準ジャッジ問題
タグ : (AC するまで非表示) / 解いたユーザー数 196
作問者 : koyumeishi
お気に入りにしたユーザー ProblemId : 745 / 自分の提出
問題文最終更新日: 2026-06-26 21:13:15
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Problem Statement

In junior high school mathematics, one proves that the proposition "the sum of $3$ consecutive positive integers is divisible by $3$" is true.
Generalizing this a little, consider the following proposition.

The sum of $N$ consecutive positive integers is divisible by $X$.

Given a positive integer $N$, find the sum of all positive integers $X$ for which this proposition is true.

Input

$N$

$N$ ($1\leq N \leq 2 \times 10^{12}$) is given on one line.

Output

$\sum X$

Output on one line the sum of the positive integers $X$ that make the proposition true.

Sample

Sample 1
Input
3
Output
4

The proposition is true for $X=1,3$, so the answer is $1+3=4$.

Sample 2
Input
2
Output
1

The proposition is true only for $X=1$.

Sample 3
Input
1145148931919
Output
1145148931920

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