A12177. Ehab and another construction problem
编程题
普及/提高-
知识点
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 $b$ ).
- $a \cdot b>x$ .
- $\frac{a}{b}<x$ .
- $1 \le a,b \le x$
- $b$ 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
10
输出 #1
6 3
输入 #2
1
输出 #2
-1