03. Combinations

import java.util.Scanner;

public class Combinations {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = Integer.parseInt(scanner.next()),
                counter = 0;

        for (int a = 0; a <= num; a++) {
            for (int b = 0; b <= num; b++) {
                for (int c = 0; c <= num; c++) {
                    if (a + b + c == num) {
                        counter++;
                    }
                }
            }
        }

        System.out.println(counter);
    }
}