An Easy Problem

题号：NC222863
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld

题目描述

Measuring the area of a certain shape is an important part of certain geometric problems.

For a point $A(x,y)_{}$ on the plane, we define the $F(x,y)_{}$ as $|x|*|y|_{}$ ,which means the area of the rectangle with the vertex $(x,0),(0,y),(0,0),(x,y)_{}$ .

You are given $n*m_{}$ vertex with integral coordinates in the form of $( i , j )_{}$ ,and $1\leq i \leq n,1\leq j\leq m$ . You need to find the K-th biggest value of $F(i,j)_{}$ ,when $1\leq i \leq n,1\leq j\leq m$ .

It's guranteed that $K\leq n*m$ .

输入描述:

Three integers ().

输出描述:

One integer,the K-th biggest value of .

示例1

输入

复制

3 3 4

输出

复制

说明

In this eaxmple, the values of all F(i,j) are 1,2,2,3,3,4,6,6,9.

So the 4-th biggest value of  is 4.