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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         Scanner scanner = new Scanner(System.in);
  6.  
  7.         long N = scanner.nextLong();
  8.         long sum=(N*(N+1))/2;
  9.  
  10.         System.out.println(sum);
  11.         scanner.close();
  12.  
  13.     }
  14. }
  15.  
Success #stdin #stdout 0.17s 56544KB
comments (?)
stdin 
23
stdout 
276
https://ideone.com/bwgSTG
language:
Java (HotSpot 12)
created:
22 days ago
visibility:
public

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