Problem: A robot is standing at the origin of the infinite two-dimensional plane. Each second the robot moves exactly 1 meter in one of the four cardinal directions: north, south, west, and east. For the first step the robot can choose any of the four directions, but then at the end of every second it has to turn 90 degrees left or right with respect to the direction it just moved in. For example, if the robot has just moved north or south, the next step it takes has to be either west or east, and vice versa.

The robot makes exactly n steps from its starting position according to the rules above. How many different points can the robot arrive to at the end? The final orientation of the robot can be ignored.

Input

The only line contains a single integer n (1 ≤ n ≤ 1000) — the number of steps the robot makes.

Output

Print a single integer — the number of different possible locations after exactly n steps.

Examples

Input


1


Output


4


Input


2


Output


4


Input


3


Output


12

Note

In the first sample case, the robot will end up 1 meter north, south, west, or east depending on its initial direction.

In the second sample case, the robot will always end up √{2} meters north-west, north-east, south-west, or south-east.

Solution (in JAVA):

Solution:

import java.util.*;

import java.io.*;

public class MoveAndTurn {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub

		InputStream inputStream = System.in;

		InputReader in = new InputReader(inputStream);
		BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));

		int n = in.nextInt();
		
		if(n%2==0) {
			
			int dots = 1;
			int lines = 1;
			
			int num = n /2 ;
			
			dots += num;
			lines += num;
			
			out.write(dots*lines+"");
			
			
		}else {
			
			int dots = 2;
			int lines = 1;
			
			int num = (n-1)/2;
			
			dots += num;
			lines += num;
			out.write(dots*lines*2+"");
			
			
		}
		
		out.close();
		
	}

	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}

		public int[] readArray(int n) {
			int[] arr = new int[n];
			for (int i = 0; i < n; i++)
				arr[i] = nextInt();
			return arr;
		}
	}

}