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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4.     public static long sumTillN(long n) {
  5.         return (n * (n + 1)) / 2;
  6.     }
  7.  
  8.     public static void main(String[] args) {
  9.         Scanner sc = new Scanner(System.in);
  10.         System.out.print("Enter N: ");
  11.         long n = sc.nextLong();
  12.         System.out.println("Sum from 0 to " + n + " is: " + sumTillN(n));
  13.         sc.close();
  14.     }
  15. }
  16.  
Success #stdin #stdout 0.19s 60800KB
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5
stdout
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Enter N: Sum from 0 to 5 is: 15
https://ideone.com/y85Rgc
language:
Java (HotSpot 12)
created:
282 days ago
visibility:
public

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