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- import java.util.*;
- import java.io.*;
- public class Main {
- public static void main(String[] args) throws IOException {
- Scanner sc = new Scanner (new File("input.txt"));
- int a = sc.nextInt();
- sc.close();
- int b = 0;
- int i;
- if (a==0) {
- b = 1;
- }else if (a>0) {
- b = ((1+(a))*(a))/2;
- }else if (a<0) {
- for (i = 1 ; i >= a; i--) {
- b+= i;
- }
- }
- PrintWriter pw = new PrintWriter(new File("output.txt"));
- pw.print(b);
- pw.close();
- }
- }
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