import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int dp[][] = new int[4][32768];
        for (int i = 1; i < 4; i++) {
            dp[i][0] = 1;
        }
        for (int j = 1; j < 32768; j++) {
            dp[1][j] = 1;
        }
        for (int i = 1; i < 4; i++) {
            for (int j = 1; j < 32768; j++) {
                if (i > j) {
                    dp[i][j] = dp[i - 1][j];
                } else
                    dp[i][j] = dp[i - 1][j] + dp[i][j - i];
            }
        }
        while (in.hasNext()) {
            int n = in.nextInt();
            System.out.println(dp[3][n]);
        }
    }
}