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题库练习 Ehab and another construction problem

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A12177 | $Ehab and another construction problem$

时间限制1s

内存限制256MB

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题目描述

Given an integer $x$ , find 2 integers $a$ and $b$ such that: - $1 \le a,b \le x$ - $b$ divides $a$ ( $a$ is divisible by $b$ ). - $a \cdot b>x$ . - $\frac{a}{b}<x$ .

输入格式

The only line contains the integer $x$ $(1 \le x \le 100)$ .

输出格式

You should output two integers $a$ and $b$ , satisfying the given conditions, separated by a space. If no pair of integers satisfy the conditions above, print "-1" (without quotes).

输入输出样例

输入 #1

输出 #1

6 3

输入 #2

输出 #2

-1

C++ 编辑器

输入

输出