A8629. Clear Symmetry

Consider some square matrix $A$ with side $n$ consisting of zeros and ones. There are $n$ rows numbered from $1$ to $n$ from top to bottom and $n$ columns numbered from $1$ to $n$ from left to right in this matrix. We'll denote the element of the matrix which is located at the intersection of the $i$ -row and the $j$ -th column as $A_{i,j}$ .

Let's call matrix $A$ clear if no two cells containing ones have a common side.

Let's call matrix $A$ symmetrical if it matches the matrices formed from it by a horizontal and/or a vertical reflection. Formally, for each pair $(i,j)$ $(1<=i,j<=n)$ both of the following conditions must be met: $A_{i,j}=A_{n-i+1,j}$ and $A_{i,j}=A_{i,n-j+1}$ .

Let's define the sharpness of matrix $A$ as the number of ones in it.

Given integer $x$ , your task is to find the smallest positive integer $n$ such that there exists a clear symmetrical matrix $A$ with side $n$ and sharpness $x$ .

The only line contains a single integer $x$ ( $1<=x<=100$ ) — the required sharpness of the matrix.

Print a single number — the sought value of $n$ .

The figure below shows the matrices that correspond to the samples: