URAL 1068 Sum

 1 import java.util.Scanner;
 2 
 3 public class P1068
 4 {
 5     public static void main(String args[])
 6     {
 7         try (Scanner cin = new Scanner(System.in))
 8         {
 9             while (cin.hasNext())
10             {
11                 int n = cin.nextInt();
12                 int result = 0;
13                 if (n < 1)
14                     for (int i = n; i <= 1; i++)
15                         result += i;
16                 else
17                     for (int i = 1; i <= n; i++)
18                         result += i;
19                 System.out.println(result);
20             }
21         }
22     }
23 }