Problem:
Score : 100 points

Problem Statement

There are N children in AtCoder Kindergarten. Mr. Evi will arrange the children in a line, then give 1 candy to the first child in the line, 2 candies to the second child, ..., N candies to the N-th child. How many candies will be necessary in total?

Constraints

1≦N≦100

Input

The input is given from Standard Input in the following format:

N

Output

Print the necessary number of candies in total.

Sample Input 1

3

Sample Output 1

6

The answer is 1+2+3=6.

Sample Input 2

10

Sample Output 2

55

The sum of the integers from 1 to 10 is 55.

Sample Input 3

1

Sample Output 3

1

Only one child. The answer is 1 in this case.

Solution in Java7 (OpenJDK 1.7.0) (judge verdict: Wrong Answer)

public class Main {
	public int Candies(int number){
		int start =1;
		int end = number;
		int slac =1;
		int sum =0;
		int temp = start;
		for (int i=1; i<=end; i++){
			sum += temp;
			temp += slac; 
		}
		System.out.println(sum);
		return sum;
		
	}

	public static void main(String[] args) {
		Main a = new Main();
		a.Candies(5);
	}

}