ZCW-SumOfInput-BlueJ/Main.java

/**
 * Created by iyasuwatts on 10/17/17.
 */
import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner keyboard = new Scanner(System.in);
        int sum = 0;
        int n = keyboard.nextInt();
        for(int i=1; i<=n; i++){
            sum += i;
        }
        System.out.println(sum);
    }
}