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 C (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include <string.h>
#include <stdlib.h>
int main()
{

        int n;
        int i;
        int j;
        int sum;

        scanf("%d",&n);

        for (i=0; i < n; i++) {
           j = i + 1;
           sum = sum + j;
        }
 
        printf("%d\n",sum);
        
	return 0;
}