View Code of Problem 30

import java.util.Scanner;

public class Main {


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Integer get = Integer.valueOf(scanner.nextLine());
        int sum = 0;
        for (int i = 1; i <= get; i++) {
            sum += i;
        }
        System.out.println(sum);
    }


}